Last line not last line error during autolevel

What is the problem?
Getting a probing failed error and connection closed on gcode files that used to work fine. This occurred after updating firmware to my Lulzbot Mini. Looking at the terminal, there is an error around lines- "Error:Line Number is not Last Line Number+1" in all failed jobs.

What did you already try to solve it?
Flashed back the old firmware, tried multiple gcode files, tried safe mode, flipped on "always" for simulate ok for resend requests. Also contacted Lulzbot tech support and they claim this is an Octoprint issue. Gcode files will print fine via direct USB connection from my PC.

Logs (octoprint.log, serial.log or output on terminal tab, browser error console ...)

2019-10-11 12:58:24,460 - octoprint.server.heartbeat - INFO - Server heartbeat <3
2019-10-11 12:58:24,493 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 12:58:24,503 - octoprint.server - INFO - --- Log roll over detected ---------------------------------------------------
2019-10-11 12:58:24,503 - octoprint.server - INFO - OctoPrint 1.3.11
2019-10-11 12:58:24,509 - octoprint.plugin.core - INFO - 31 plugin(s) registered with the system:
|  Action Command Prompt Support (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/action_command_prompt
|  Action Commands (0.1) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_actioncommands
|  Announcement Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/announcements
|  Anonymous Usage Tracking (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/tracking
|  Application Keys Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/appkeys
|  Autoselect Plugin (0.2.0) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_autoselect
|  Backup & Restore (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/backup
|  BetterHeaterTimeout (1.2.0) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_BetterHeaterTimeout
|  Core Wizard (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/corewizard
|  Custom Control Editor (0.2.1) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_customControl
|  Discovery (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/discovery
|  Emergency Stop Button (0.1.2) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_estop
|  Error Tracking (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/errortracking
|  Force Login (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/forcelogin
|  GcodeEditor (0.2.6) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_GcodeEditor
|  ipOnConnect (0.2.2) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_ipOnConnect
|  LayerDisplay (0.4.1) = /home/pi/oprint/local/lib/python2.7/site-packages/layerdisplay
|  Logging (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/logging
|  MultipleUpload Plugin (1.0.0) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_MultipleUpload
|  Navbar Temperature Plugin (0.11) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_navbartemp
| !Octolapse (0.3.4) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_octolapse
|  Pi Support Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/pi_support
|  Plugin Manager (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/pluginmanager
|  PortLister (0.1.8) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_portlister
|  Printer Safety Check (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/printer_safety_check
|  Printer Stats (1.0.0) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_stats
|  RTMP Streamer (0.1.3) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_rtmpstreamer
|  Software Update (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/softwareupdate
|  Tab Order (0.5.3) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_taborder
|  Virtual Printer (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/virtual_printer
|  Yamlpatcher (0.1.1) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_yamlpatcher
2019-10-11 12:58:24,547 - octoprint.environment - INFO - Detected environment is Python 2.7.13 under Linux (linux2). Details:
|  hardware:
|    cores: 4
|    freq: 1200.0
|    ram: 918188032
|  os:
|    id: linux
|    platform: linux2
|  plugins:
|    pi_support:
|      model: Raspberry Pi 3 Model B Rev 1.2
|      octopi_version: 0.16.0
|  python:
|    pip: 19.0.1
|    version: 2.7.13
|    virtualenv: /home/pi/oprint
2019-10-11 12:58:24,548 - octoprint.server - INFO - ------------------------------------------------------------------------------
2019-10-11 12:58:25,161 - octoprint.server.preemptive_cache - INFO - Preemptively caching / (ui _default) for {'query_string': 'l10n=en', 'path': '/', 'base_url': 'http://10.63.142.13/'}
2019-10-11 12:58:45,340 - octoprint.server.preemptive_cache - INFO - ... done in 20.18s
2019-10-11 12:58:54,575 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 12:59:24,623 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 12:59:54,671 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:00:24,716 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:00:54,762 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:01:24,807 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:01:54,851 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:02:05,787 - octoprint.server.util.flask - INFO - Passively logging in user 3Dadmin from ::ffff:10.64.21.46
2019-10-11 13:02:07,073 - octoprint.server.util.sockjs - INFO - New connection from client: ::ffff:10.64.21.46
2019-10-11 13:02:07,316 - octoprint.server.util.flask - INFO - Passively logging in user 3Dadmin from ::ffff:10.64.21.46
2019-10-11 13:02:08,738 - octoprint.plugins.rtmpstreamer - INFO - Checking stream status.
2019-10-11 13:02:09,309 - octoprint.plugins.softwareupdate - WARNING - Could not check rtmpstreamer for updates due to a network error
2019-10-11 13:02:09,311 - octoprint.plugins.softwareupdate - WARNING - Could not check layerdisplay for updates due to a network error
2019-10-11 13:02:09,346 - octoprint.plugins.softwareupdate - WARNING - Could not check actioncommands for updates due to a network error
2019-10-11 13:02:09,358 - octoprint.plugins.softwareupdate - WARNING - Could not check BetterHeaterTimeout for updates due to a network error
2019-10-11 13:02:09,371 - octoprint.plugins.softwareupdate - WARNING - Could not check autoselect for updates due to a network error
2019-10-11 13:02:09,409 - octoprint.plugins.softwareupdate - WARNING - Could not check customcontrol for updates due to a network error
2019-10-11 13:02:09,439 - octoprint.plugins.softwareupdate - WARNING - Could not check navbartemp for updates due to a network error
2019-10-11 13:02:09,451 - octoprint.plugins.softwareupdate - WARNING - Could not check taborder for updates due to a network error
2019-10-11 13:02:09,464 - octoprint.plugins.softwareupdate - WARNING - Could not check octoprint for updates due to a network error
2019-10-11 13:02:09,494 - octoprint.plugins.softwareupdate - WARNING - Could not check ipOnConnect for updates due to a network error
2019-10-11 13:02:09,510 - octoprint.plugins.softwareupdate - WARNING - Could not check GcodeEditor for updates due to a network error
2019-10-11 13:02:09,573 - octoprint.plugins.softwareupdate - WARNING - Could not check stats for updates due to a network error
2019-10-11 13:02:09,609 - octoprint.plugins.softwareupdate - WARNING - Could not check portlister for updates due to a network error
2019-10-11 13:02:09,621 - octoprint.plugins.softwareupdate - WARNING - Could not check MultipleUpload for updates due to a network error
2019-10-11 13:02:09,623 - octoprint.plugins.softwareupdate - WARNING - Could not check estop for updates due to a network error
2019-10-11 13:02:09,623 - octoprint.plugins.softwareupdate - WARNING - Could not check yamlpatcher for updates due to a network error
2019-10-11 13:02:09,774 - octoprint.plugins.softwareupdate - INFO - Saved version cache to disk
2019-10-11 13:02:09,851 - octoprint.server.util.sockjs - INFO - User 3Dadmin logged in on the socket from client ::ffff:10.64.21.46
2019-10-11 13:02:18,746 - octoprint.server.util.sockjs - INFO - Client connection closed: ::ffff:10.64.21.46
2019-10-11 13:02:18,892 - octoprint.server.util.sockjs - INFO - New connection from client: ::ffff:10.64.21.46
2019-10-11 13:02:19,156 - octoprint.server.util.sockjs - INFO - Client connection closed: ::ffff:10.64.21.46
2019-10-11 13:02:24,895 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:02:54,951 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:03:15,017 - octoprint.server.util.flask - INFO - Passively logging in user 3Dadmin from ::ffff:10.64.21.46
2019-10-11 13:03:16,162 - octoprint.server.util.sockjs - INFO - New connection from client: ::ffff:10.64.21.46
2019-10-11 13:03:16,568 - octoprint.server.util.flask - INFO - Passively logging in user 3Dadmin from ::ffff:10.64.21.46
2019-10-11 13:03:17,595 - octoprint.plugins.rtmpstreamer - INFO - Checking stream status.
2019-10-11 13:03:18,034 - octoprint.server.util.sockjs - INFO - User 3Dadmin logged in on the socket from client ::ffff:10.64.21.46
2019-10-11 13:03:24,997 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:03:55,045 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:04:25,096 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:04:55,144 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:05:25,202 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:05:55,251 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:06:21,641 - octoprint.filemanager.analysis - INFO - Starting analysis of local:S_Peery/LM_Ankylosaurus.gcode
2019-10-11 13:06:21,649 - octoprint.filemanager.analysis - INFO - Invoking analysis command: /home/pi/oprint/bin/python2 -m octoprint analysis gcode --speed-x=6000 --speed-y=6000 --max-t=10 --throttle=0.0 --throttle-lines=100 /home/pi/.octoprint/uploads/S_Peery/LM_Ankylosaurus.gcode
2019-10-11 13:06:21,687 - octoprint.plugins.autoselect - INFO - Selecting S_Peery/LM_Ankylosaurus.gcode on local that was just uploaded
2019-10-11 13:06:21,704 - octoprint.printer.standard.job - INFO - Print job selected - origin: local, path: S_Peery/LM_Ankylosaurus.gcode, owner: None, user: None
2019-10-11 13:06:25,301 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:06:32,996 - octoprint.filemanager.analysis - INFO - Analysis of entry local:S_Peery/LM_Ankylosaurus.gcode finished, needed 11.36s
2019-10-11 13:06:55,346 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:07:25,394 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:07:38,814 - octoprint.util.comm - INFO - Changing monitoring state from "Operational" to "Starting"
2019-10-11 13:07:38,835 - octoprint.printer.standard.job - INFO - Print job started - origin: local, path: S_Peery/LM_Ankylosaurus.gcode, owner: 3Dadmin, user: 3Dadmin
2019-10-11 13:07:38,882 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-11 13:07:38,894 - octoprint.util.comm - INFO - Changing monitoring state from "Starting" to "Printing"
2019-10-11 13:07:41,002 - octoprint.util.comm - INFO - Printer seems to support the busy protocol, will adjust timeouts and set busy interval accordingly
2019-10-11 13:07:55,443 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:08:08,995 - octoprint.util.comm - INFO - Telling the printer to set the busy interval to our "communicationBusy" timeout - 1s = 2s
2019-10-11 13:08:09,071 - octoprint.util.comm - INFO - Got a resend request from the printer: requested line = 13, current line = 15
| Last lines in terminal:
| Recv: echo:busy: processing
| Recv:  T:22.31 /0.00 B:29.58 /60.00 @:0 B@:127
| Recv: echo:busy: processing
| Recv:  T:22.28 /0.00 B:30.19 /60.00 @:0 B@:127
| Recv: echo:busy: processing
| Recv:  T:22.19 /0.00 B:30.89 /60.00 @:0 B@:127
| Recv: echo:busy: processing
| Recv:  T:22.31 /0.00 B:31.69 /60.00 @:0 B@:127
| Recv: echo:busy: processing
| Recv:  T:22.34 /0.00 B:32.36 /60.00 @:0 B@:127
| Recv: X:5.00 Y:185.00 Z:157.00 E:0.00 Count X:503 Y:18593 Z:251200
| Recv: ok N11 P15 B4
| Send: N12 M113 S2*82
| Recv: ok N12 P15 B4
| Send: N13 G0 X0 Y187 Z156 F200*8
| Recv: echo:Unknown command: ""
| Recv: ok P15 B4
| Send: N14 M109 R140*89
| Recv: Error:Line Number is not Last Line Number+1, Last Line: 12
| Recv: Resend: 13
2019-10-11 13:08:25,489 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:08:55,544 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:09:25,593 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:09:55,648 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:10:25,702 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:10:47,440 - octoprint.util.comm - WARNING - Received an error from the printer's firmware: Probing failed
| Last lines in terminal:
| Recv: echo:busy: processing
| Recv:  T:140.14 /140.00 B:59.93 /60.00 @:44 B@:49
| Recv: echo:busy: processing
| Recv:  T:140.08 /140.00 B:59.93 /60.00 @:46 B@:54
| Recv: echo:busy: processing
| Recv:  T:139.99 /140.00 B:60.06 /60.00 @:47 B@:28
| Recv: echo:busy: processing
| Recv:  T:139.95 /140.00 B:60.16 /60.00 @:48 B@:5
| Recv: echo:busy: processing
| Recv:  T:139.96 /140.00 B:60.10 /60.00 @:47 B@:11
| Recv: echo:busy: processing
| Recv:  T:139.87 /140.00 B:60.03 /60.00 @:49 B@:22
| Recv: echo:busy: processing
| Recv:  T:139.94 /140.00 B:59.92 /60.00 @:47 B@:45
| Recv: echo:busy: processing
| Recv:  T:139.88 /140.00 B:59.92 /60.00 @:48 B@:48
| Recv: echo:busy: processing
| Recv:  T:139.90 /140.00 B:59.94 /60.00 @:48 B@:47
| Recv: echo:busy: processing
| Recv: Error:Probing failed
2019-10-11 13:10:47,459 - octoprint.util.comm - INFO - Changing monitoring state from "Printing" to "Error: Probing failed"
2019-10-11 13:10:47,481 - octoprint.util.comm - INFO - Changing monitoring state from "Error: Probing failed" to "Offline (Error: Probing failed)"
2019-10-11 13:10:55,750 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:11:25,803 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:11:55,851 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:12:25,899 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:12:55,947 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:13:24,476 - octoprint.server.heartbeat - INFO - Server heartbeat <3
2019-10-11 13:13:25,999 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:13:56,050 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:14:26,096 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:14:56,141 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:15:26,189 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:15:56,254 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:16:02,211 - octoprint.util.comm - INFO - Changing monitoring state from "Offline" to "Opening serial port"
2019-10-11 13:16:02,215 - octoprint.util.comm - INFO - Changing monitoring state from "Opening serial port" to "Connecting"
2019-10-11 13:16:02,226 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-11 13:16:03,126 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-11 13:16:03,443 - octoprint.util.comm - INFO - Changing monitoring state from "Connecting" to "Operational"
2019-10-11 13:16:03,450 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-11 13:16:03,462 - octoprint.plugins.ipOnConnect - INFO - ipOnConnectPlugin: 10.63.142.13
2019-10-11 13:16:03,487 - octoprint.util.comm - INFO - Printer reports firmware name "Marlin"
2019-10-11 13:16:03,492 - octoprint.util.comm - INFO - Firmware states that it supports temperature autoreporting
2019-10-11 13:16:03,500 - octoprint.util.comm - INFO - Firmware states that it supports emergency GCODEs to be sent without waiting for an acknowledgement first
2019-10-11 13:16:17,111 - octoprint.printer.standard.job - INFO - Print job selected - origin: local, path: S_Peery/LM_Ankylosaurus.gcode, owner: 3Dadmin, user: 3Dadmin
2019-10-11 13:16:17,153 - octoprint.util.comm - INFO - Changing monitoring state from "Operational" to "Starting"
2019-10-11 13:16:17,165 - octoprint.printer.standard.job - INFO - Print job started - origin: local, path: S_Peery/LM_Ankylosaurus.gcode, owner: 3Dadmin, user: 3Dadmin
2019-10-11 13:16:17,181 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-11 13:16:17,198 - octoprint.util.comm - INFO - Changing monitoring state from "Starting" to "Printing"
2019-10-11 13:16:19,340 - octoprint.util.comm - INFO - Printer seems to support the busy protocol, will adjust timeouts and set busy interval accordingly
2019-10-11 13:16:26,414 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:16:43,790 - octoprint.util.comm - INFO - Telling the printer to set the busy interval to our "communicationBusy" timeout - 1s = 2s
2019-10-11 13:16:43,842 - octoprint.util.comm - INFO - Got a resend request from the printer: requested line = 13, current line = 15
| Last lines in terminal:
| Recv: echo:busy: processing
| Recv:  T:70.37 /0.00 B:53.63 /60.00 @:0 B@:127
| Recv: echo:busy: processing
| Recv:  T:69.85 /0.00 B:54.21 /60.00 @:0 B@:127
| Recv: echo:busy: processing
| Recv:  T:69.22 /0.00 B:54.83 /60.00 @:0 B@:127
| Recv: echo:busy: processing
| Recv:  T:68.63 /0.00 B:55.46 /60.00 @:0 B@:127
| Recv: echo:busy: processing
| Recv:  T:68.01 /0.00 B:56.01 /60.00 @:0 B@:127
| Recv: X:5.00 Y:185.00 Z:157.00 E:0.00 Count X:503 Y:18593 Z:251200
| Recv: ok N11 P15 B4
| Send: N12 M113 S2*82
| Recv: ok N12 P15 B4
| Send: N13 G0 X0 Y187 Z156 F200*8
| Recv: echo:Unknown command: ""
| Recv: ok P15 B4
| Send: N14 M109 R140*89
| Recv: Error:Line Number is not Last Line Number+1, Last Line: 12
| Recv: Resend: 13
2019-10-11 13:16:56,472 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:17:26,525 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:17:56,575 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:18:26,624 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:18:56,676 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:19:00,095 - octoprint.util.comm - WARNING - Received an error from the printer's firmware: Probing failed
| Last lines in terminal:
| Recv:  T:140.16 /140.00 B:60.07 /60.00 @:43 B@:16
| Recv: echo:busy: processing
| Recv:  T:140.14 /140.00 B:60.06 /60.00 @:43 B@:15
| Recv: echo:busy: processing
| Recv:  T:140.04 /140.00 B:59.95 /60.00 @:46 B@:37
| Recv: echo:busy: processing
| Recv:  T:139.97 /140.00 B:59.94 /60.00 @:47 B@:39
| Recv: echo:busy: processing
| Recv:  T:139.94 /140.00 B:59.93 /60.00 @:47 B@:44
| Recv: echo:busy: processing
| Recv:  T:139.95 /140.00 B:59.99 /60.00 @:46 B@:34
| Recv: echo:busy: processing
| Recv:  T:139.89 /140.00 B:60.04 /60.00 @:47 B@:24
| Recv: echo:busy: processing
| Recv:  T:139.91 /140.00 B:60.07 /60.00 @:47 B@:16
| Recv: echo:busy: processing
| Recv:  T:139.92 /140.00 B:60.08 /60.00 @:46 B@:10
| Recv: echo:busy: processing
| Recv:  T:139.91 /140.00 B:60.01 /60.00 @:47 B@:23
| Recv: Error:Probing failed
2019-10-11 13:19:00,100 - octoprint.util.comm - INFO - Changing monitoring state from "Printing" to "Error: Probing failed"
2019-10-11 13:19:00,150 - octoprint.util.comm - INFO - Changing monitoring state from "Error: Probing failed" to "Offline (Error: Probing failed)"
2019-10-11 13:19:26,729 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:19:48,529 - octoprint.util.comm - INFO - Changing monitoring state from "Offline" to "Opening serial port"
2019-10-11 13:19:48,535 - octoprint.util.comm - INFO - Changing monitoring state from "Opening serial port" to "Connecting"
2019-10-11 13:19:48,544 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-11 13:19:49,450 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-11 13:19:49,762 - octoprint.util.comm - INFO - Changing monitoring state from "Connecting" to "Operational"
2019-10-11 13:19:49,770 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-11 13:19:49,781 - octoprint.plugins.ipOnConnect - INFO - ipOnConnectPlugin: 10.63.142.13
2019-10-11 13:19:49,806 - octoprint.util.comm - INFO - Printer reports firmware name "Marlin"
2019-10-11 13:19:49,811 - octoprint.util.comm - INFO - Firmware states that it supports temperature autoreporting
2019-10-11 13:19:49,822 - octoprint.util.comm - INFO - Firmware states that it supports emergency GCODEs to be sent without waiting for an acknowledgement first
2019-10-11 13:19:56,780 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:20:18,824 - octoprint.printer.standard.job - INFO - Print job selected - origin: local, path: S_Peery/LM_Testblock_20_20_5_PLA.gcode, owner: 3Dadmin, user: 3Dadmin
2019-10-11 13:20:18,847 - octoprint.util.comm - INFO - Changing monitoring state from "Operational" to "Starting"
2019-10-11 13:20:18,862 - octoprint.printer.standard.job - INFO - Print job started - origin: local, path: S_Peery/LM_Testblock_20_20_5_PLA.gcode, owner: 3Dadmin, user: 3Dadmin
2019-10-11 13:20:18,888 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-11 13:20:18,890 - octoprint.printer.standard - ERROR - Exception while pushing current data to callback <layerdisplay.LayerDisplayPlugin object at 0x739507f0>
Traceback (most recent call last):
  File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint/printer/standard.py", line 196, in _sendCurrentDataCallbacks
    callback.on_printer_send_current_data(copy.deepcopy(data))
  File "/home/pi/oprint/local/lib/python2.7/site-packages/layerdisplay/__init__.py", line 46, in on_printer_send_current_data
    progress = data['progress']['completion'] / 100
TypeError: unsupported operand type(s) for /: 'NoneType' and 'int'
2019-10-11 13:20:18,903 - octoprint.util.comm - INFO - Changing monitoring state from "Starting" to "Printing"
2019-10-11 13:20:21,026 - octoprint.util.comm - INFO - Printer seems to support the busy protocol, will adjust timeouts and set busy interval accordingly
2019-10-11 13:20:26,836 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:20:51,557 - octoprint.util.comm - INFO - Telling the printer to set the busy interval to our "communicationBusy" timeout - 1s = 2s
2019-10-11 13:20:51,628 - octoprint.util.comm - INFO - Got a resend request from the printer: requested line = 14, current line = 16
| Last lines in terminal:
| Recv:  T:135.66 /0.00 B:60.04 /60.00 @:0 B@:40
| Recv: echo:busy: processing
| Recv:  T:134.32 /0.00 B:60.06 /60.00 @:0 B@:35
| Recv: echo:busy: processing
| Recv:  T:132.96 /0.00 B:60.15 /60.00 @:0 B@:14
| Recv: echo:busy: processing
| Recv:  T:131.48 /0.00 B:60.13 /60.00 @:0 B@:12
| Recv: echo:busy: processing
| Recv:  T:130.15 /0.00 B:60.05 /60.00 @:0 B@:22
| Recv: echo:busy: processing
| Recv: X:5.00 Y:185.00 Z:157.00 E:0.00 Count X:503 Y:18593 Z:251200
| Recv: ok N12 P15 B4
| Send: N13 M113 S2*83
| Recv: ok N13 P15 B4
| Send: N14 G0 X0 Y187 Z156 F200*15
| Recv: echo:Unknown command: ""
| Recv: ok P15 B4
| Send: N15 M109 R140*88
| Recv: Error:Line Number is not Last Line Number+1, Last Line: 13
| Recv: Resend: 14
2019-10-11 13:20:56,893 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:21:26,946 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:21:56,996 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:22:27,048 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:22:29,694 - octoprint.util.comm - WARNING - Received an error from the printer's firmware: Probing failed
| Last lines in terminal:
| Recv: echo:busy: processing
| Recv:  T:140.14 /140.00 B:60.02 /60.00 @:42 B@:26
| Recv: echo:busy: processing
| Recv:  T:140.13 /140.00 B:60.04 /60.00 @:43 B@:19
| Recv: echo:busy: processing
| Recv:  T:140.08 /140.00 B:60.00 /60.00 @:44 B@:27
| Recv: echo:busy: processing
| Recv:  T:140.03 /140.00 B:60.00 /60.00 @:45 B@:27
| Recv: echo:busy: processing
| Recv:  T:140.01 /140.00 B:60.00 /60.00 @:45 B@:28
| Recv: echo:busy: processing
| Recv:  T:140.00 /140.00 B:59.98 /60.00 @:45 B@:34
| Recv: echo:busy: processing
| Recv:  T:139.96 /140.00 B:60.01 /60.00 @:46 B@:28
| Recv: echo:busy: processing
| Recv:  T:139.92 /140.00 B:60.02 /60.00 @:47 B@:25
| Recv: echo:busy: processing
| Recv:  T:139.90 /140.00 B:60.03 /60.00 @:47 B@:22
| Recv: echo:busy: processing
| Recv: Error:Probing failed
2019-10-11 13:22:29,709 - octoprint.util.comm - INFO - Changing monitoring state from "Printing" to "Error: Probing failed"
2019-10-11 13:22:29,746 - octoprint.util.comm - INFO - Changing monitoring state from "Error: Probing failed" to "Offline (Error: Probing failed)"
2019-10-11 13:22:57,106 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:23:27,153 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-11 13:23:48,827 - octoprint.server.util.sockjs - INFO - Client connection closed: ::ffff:10.64.21.46

Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ...)
Running Octoprint 1.3.11, slicing with Cura lulzbot, printing with Lulzbot Mini (v1)

It kind of looks like your firmware got confused about a basic G0 command. Given the response, it sounds like this is a send error to the controller board.

Review the serial cable (should have internal metallic shielding or a ferrite core), it should be as short as possible and finally, verify that you're not running an undervoltage condition.

I swapped out the USB cable to one I know works- still getting the error. Also not an undervoltage situation. I also just re-imaged the SD card, but that didn't work. Still having that last line hiccup.

Trying running a gcode command in the Terminal tab and see if your firmware likes it.

G0 X Y

Please share a full serial.log

Here is a serial log from today. I also swapped out printers (we have multiple Lulzbot minis) and got the same error with the original RasPi connected to a new printer. Swapping the other way (problem printer with working RasPi) resulted in no errors, so this does seem to be tied to Octoprint on that particular RasPi.

2019-10-14 15:49:10,451 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:49:10,459 - octoprint.server.heartbeat - INFO - Server heartbeat <3
2019-10-14 15:49:10,511 - octoprint.server - INFO - --- Log roll over detected ---------------------------------------------------
2019-10-14 15:49:10,512 - octoprint.server - INFO - OctoPrint 1.3.11
2019-10-14 15:49:10,654 - octoprint.plugin.core - INFO - 32 plugin(s) registered with the system:
|  Action Command Prompt Support (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/action_command_prompt
|  Action Commands (0.1) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_actioncommands
|  Announcement Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/announcements
|  Anonymous Usage Tracking (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/tracking
|  Application Keys Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/appkeys
|  Automatic Shutdown (0.1.4) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_automaticshutdown
|  Autoselect Plugin (0.2.0) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_autoselect
|  Backup & Restore (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/backup
|  BetterHeaterTimeout (1.2.0) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_BetterHeaterTimeout
|  Core Wizard (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/corewizard
|  Custom Control Editor (0.2.1) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_customControl
|  Discovery (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/discovery
|  Emergency Stop Button (0.1.2) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_estop
|  Error Tracking (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/errortracking
|  Force Login (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/forcelogin
|  GcodeEditor (0.2.6) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_GcodeEditor
|  ipOnConnect (0.2.2) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_ipOnConnect
|  LayerDisplay (0.4.1) = /home/pi/oprint/local/lib/python2.7/site-packages/layerdisplay
|  Logging (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/logging
|  MultipleUpload Plugin (1.0.0) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_MultipleUpload
|  Navbar Temperature Plugin (0.11) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_navbartemp
| !Octolapse (0.3.4) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_octolapse
|  Pi Support Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/pi_support
|  Plugin Manager (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/pluginmanager
|  PortLister (0.1.8) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_portlister
|  Printer Safety Check (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/printer_safety_check
|  Printer Stats (1.0.0) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_stats
|  RTMP Streamer (0.1.3) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_rtmpstreamer
|  Software Update (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/softwareupdate
|  Tab Order (0.5.3) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_taborder
|  Virtual Printer (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/virtual_printer
|  Yamlpatcher (0.1.1) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_yamlpatcher
2019-10-14 15:49:10,750 - octoprint.environment - INFO - Detected environment is Python 2.7.13 under Linux (linux2). Details:
|  hardware:
|    cores: 4
|    freq: 1200.0
|    ram: 918188032
|  os:
|    id: linux
|    platform: linux2
|  plugins:
|    pi_support:
|      model: Raspberry Pi 3 Model B Rev 1.2
|      octopi_version: 0.16.0
|  python:
|    pip: 19.0.1
|    version: 2.7.13
|    virtualenv: /home/pi/oprint
2019-10-14 15:49:10,750 - octoprint.server - INFO - ------------------------------------------------------------------------------
2019-10-14 15:49:11,224 - tornado.access - WARNING - 404 GET /intermediary.gif?_=1571064543123 (::ffff:10.64.22.145) 12.81ms
2019-10-14 15:49:15,115 - octoprint.server.util.sockjs - INFO - New connection from client: ::ffff:10.64.22.145
2019-10-14 15:49:28,115 - octoprint.server.preemptive_cache - INFO - ... done in 21.31s
2019-10-14 15:49:40,892 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:50:10,934 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:50:19,980 - octoprint.server.api - INFO - Actively logging in user 3Dadmin from ::ffff:10.64.22.145
2019-10-14 15:50:20,017 - octoprint.server.util.sockjs - INFO - Client connection closed: ::ffff:10.64.22.145
2019-10-14 15:50:20,073 - octoprint.server.util.flask - INFO - Passively logging in user 3Dadmin from ::ffff:10.64.22.145
2019-10-14 15:50:20,853 - octoprint.server.util.sockjs - INFO - New connection from client: ::ffff:10.64.22.145
2019-10-14 15:50:21,059 - octoprint.server.util.flask - INFO - Passively logging in user 3Dadmin from ::ffff:10.64.22.145
2019-10-14 15:50:22,087 - octoprint.plugins.rtmpstreamer - INFO - Checking stream status.
2019-10-14 15:50:22,417 - octoprint.plugins.announcements - ERROR - Could not fetch channel _important from https://octoprint.org/feeds/important.xml: HTTPSConnectionPool(host='octoprint.org', port=443): Max retries exceeded with url: /feeds/important.xml (Caused by SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)'),))
Traceback (most recent call last):
  File "/home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/announcements/__init__.py", line 355, in _get_channel_data_from_network
    r = requests.get(url, timeout=30)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/api.py", line 75, in get
    return request('get', url, params=params, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/api.py", line 60, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/adapters.py", line 514, in send
    raise SSLError(e, request=request)
SSLError: HTTPSConnectionPool(host='octoprint.org', port=443): Max retries exceeded with url: /feeds/important.xml (Caused by SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)'),))
2019-10-14 15:50:22,490 - octoprint.plugins.announcements - ERROR - Could not fetch channel _releases from https://octoprint.org/feeds/releases.xml: HTTPSConnectionPool(host='octoprint.org', port=443): Max retries exceeded with url: /feeds/releases.xml (Caused by SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)'),))
Traceback (most recent call last):
  File "/home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/announcements/__init__.py", line 355, in _get_channel_data_from_network
    r = requests.get(url, timeout=30)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/api.py", line 75, in get
    return request('get', url, params=params, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/api.py", line 60, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/adapters.py", line 514, in send
    raise SSLError(e, request=request)
SSLError: HTTPSConnectionPool(host='octoprint.org', port=443): Max retries exceeded with url: /feeds/releases.xml (Caused by SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)'),))
2019-10-14 15:50:22,558 - octoprint.plugins.announcements - ERROR - Could not fetch channel _blog from https://octoprint.org/feeds/octoblog.xml: HTTPSConnectionPool(host='octoprint.org', port=443): Max retries exceeded with url: /feeds/octoblog.xml (Caused by SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)'),))
Traceback (most recent call last):
  File "/home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/announcements/__init__.py", line 355, in _get_channel_data_from_network
    r = requests.get(url, timeout=30)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/api.py", line 75, in get
    return request('get', url, params=params, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/api.py", line 60, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/adapters.py", line 514, in send
    raise SSLError(e, request=request)
SSLError: HTTPSConnectionPool(host='octoprint.org', port=443): Max retries exceeded with url: /feeds/octoblog.xml (Caused by SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)'),))
2019-10-14 15:50:22,626 - octoprint.plugins.announcements - ERROR - Could not fetch channel _plugins from https://plugins.octoprint.org/feed.xml: HTTPSConnectionPool(host='plugins.octoprint.org', port=443): Max retries exceeded with url: /feed.xml (Caused by SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)'),))
Traceback (most recent call last):
  File "/home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/announcements/__init__.py", line 355, in _get_channel_data_from_network
    r = requests.get(url, timeout=30)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/api.py", line 75, in get
    return request('get', url, params=params, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/api.py", line 60, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/adapters.py", line 514, in send
    raise SSLError(e, request=request)
SSLError: HTTPSConnectionPool(host='plugins.octoprint.org', port=443): Max retries exceeded with url: /feed.xml (Caused by SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)'),))
2019-10-14 15:50:22,692 - octoprint.plugins.announcements - ERROR - Could not fetch channel _octopi from https://octoprint.org/feeds/octopi.xml: HTTPSConnectionPool(host='octoprint.org', port=443): Max retries exceeded with url: /feeds/octopi.xml (Caused by SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)'),))
Traceback (most recent call last):
  File "/home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/announcements/__init__.py", line 355, in _get_channel_data_from_network
    r = requests.get(url, timeout=30)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/api.py", line 75, in get
    return request('get', url, params=params, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/api.py", line 60, in request
    return session.request(method=method, url=url, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/sessions.py", line 533, in request
    resp = self.send(prep, **send_kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/sessions.py", line 646, in send
    r = adapter.send(request, **kwargs)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/requests/adapters.py", line 514, in send
    raise SSLError(e, request=request)
SSLError: HTTPSConnectionPool(host='octoprint.org', port=443): Max retries exceeded with url: /feeds/octopi.xml (Caused by SSLError(SSLError(1, u'[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:661)'),))
2019-10-14 15:50:23,059 - octoprint.plugins.softwareupdate - WARNING - Could not check layerdisplay for updates due to a network error
2019-10-14 15:50:23,083 - octoprint.plugins.softwareupdate - WARNING - Could not check BetterHeaterTimeout for updates due to a network error
2019-10-14 15:50:23,100 - octoprint.plugins.softwareupdate - WARNING - Could not check rtmpstreamer for updates due to a network error
2019-10-14 15:50:23,120 - octoprint.plugins.softwareupdate - WARNING - Could not check autoselect for updates due to a network error
2019-10-14 15:50:23,130 - octoprint.plugins.softwareupdate - WARNING - Could not check actioncommands for updates due to a network error
2019-10-14 15:50:23,158 - octoprint.plugins.softwareupdate - WARNING - Could not check MultipleUpload for updates due to a network error
2019-10-14 15:50:23,204 - octoprint.plugins.softwareupdate - WARNING - Could not check octoprint for updates due to a network error
2019-10-14 15:50:23,231 - octoprint.plugins.softwareupdate - WARNING - Could not check navbartemp for updates due to a network error
2019-10-14 15:50:23,247 - octoprint.plugins.softwareupdate - WARNING - Could not check GcodeEditor for updates due to a network error
2019-10-14 15:50:23,254 - octoprint.plugins.softwareupdate - WARNING - Could not check ipOnConnect for updates due to a network error
2019-10-14 15:50:23,269 - octoprint.plugins.softwareupdate - WARNING - Could not check taborder for updates due to a network error
2019-10-14 15:50:23,315 - octoprint.plugins.softwareupdate - WARNING - Could not check automaticshutdown for updates due to a network error
2019-10-14 15:50:23,350 - octoprint.plugins.softwareupdate - WARNING - Could not check estop for updates due to a network error
2019-10-14 15:50:23,360 - octoprint.plugins.softwareupdate - WARNING - Could not check customcontrol for updates due to a network error
2019-10-14 15:50:23,370 - octoprint.plugins.softwareupdate - WARNING - Could not check yamlpatcher for updates due to a network error
2019-10-14 15:50:23,380 - octoprint.plugins.softwareupdate - WARNING - Could not check stats for updates due to a network error
2019-10-14 15:50:23,399 - octoprint.plugins.softwareupdate - WARNING - Could not check portlister for updates due to a network error
2019-10-14 15:50:23,543 - octoprint.plugins.softwareupdate - INFO - Saved version cache to disk
2019-10-14 15:50:23,655 - octoprint.server.util.sockjs - INFO - User 3Dadmin logged in on the socket from client ::ffff:10.64.22.145
2019-10-14 15:50:40,976 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:51:04,368 - octoprint.util.comm - INFO - Changing monitoring state from "Offline" to "Detecting serial port"
2019-10-14 15:51:05,002 - octoprint.util.comm - INFO - Changing monitoring state from "Detecting serial port" to "Opening serial port"
2019-10-14 15:51:05,008 - octoprint.util.comm - INFO - Changing monitoring state from "Opening serial port" to "Connecting"
2019-10-14 15:51:05,016 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-14 15:51:05,918 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-14 15:51:06,229 - octoprint.util.comm - INFO - Changing monitoring state from "Connecting" to "Operational"
2019-10-14 15:51:06,245 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-14 15:51:06,296 - octoprint.plugins.ipOnConnect - INFO - ipOnConnectPlugin: 10.63.142.13
2019-10-14 15:51:06,298 - octoprint.util.comm - INFO - Printer reports firmware name "Marlin"
2019-10-14 15:51:06,320 - octoprint.util.comm - INFO - Firmware states that it supports temperature autoreporting
2019-10-14 15:51:06,347 - octoprint.util.comm - INFO - Firmware states that it supports emergency GCODEs to be sent without waiting for an acknowledgement first
2019-10-14 15:51:11,022 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:51:41,068 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:52:11,117 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:52:21,715 - octoprint.timelapse - WARNING - Cannot capture image, image number is unset
2019-10-14 15:52:41,166 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:53:11,217 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:53:18,216 - octoprint.printer.standard.job - INFO - Print job selected - origin: local, path: SP/LM_Ni_calibration.gcode, owner: 3Dadmin, user: 3Dadmin
2019-10-14 15:53:18,244 - octoprint.util.comm - INFO - Changing monitoring state from "Operational" to "Starting"
2019-10-14 15:53:18,256 - octoprint.printer.standard.job - INFO - Print job started - origin: local, path: SP/LM_Ni_calibration.gcode, owner: 3Dadmin, user: 3Dadmin
2019-10-14 15:53:18,278 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-14 15:53:18,291 - octoprint.util.comm - INFO - Changing monitoring state from "Starting" to "Printing"
2019-10-14 15:53:41,265 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:54:11,316 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:54:41,364 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:55:11,416 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:55:41,468 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:55:43,739 - octoprint.util.comm - INFO - Changing monitoring state from "Printing" to "Cancelling"
2019-10-14 15:55:43,762 - octoprint.util.comm - INFO - Force-sending M108 to the printer
2019-10-14 15:55:43,786 - octoprint.printer.standard.job - INFO - Print job cancelled - origin: local, path: SP/LM_Ni_calibration.gcode, owner: 3Dadmin, user: 3Dadmin
2019-10-14 15:55:47,702 - octoprint.util.comm - INFO - Changing monitoring state from "Cancelling" to "Operational"
2019-10-14 15:56:11,518 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:56:14,682 - octoprint.util.comm - ERROR - Unexpected error while reading from serial port
Traceback (most recent call last):
  File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint/util/comm.py", line 2739, in _readline
    ret = self._serial.readline()
  File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint/util/comm.py", line 4844, in readline
    c = self.read(1)
  File "/home/pi/oprint/local/lib/python2.7/site-packages/serial/serialposix.py", line 501, in read
    'device reports readiness to read but returned no data '
SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
2019-10-14 15:56:14,725 - octoprint.util.comm - ERROR - Please see https://faq.octoprint.org/serialerror for possible reasons of this.
2019-10-14 15:56:14,753 - octoprint.util.comm - INFO - Changing monitoring state from "Operational" to "Offline (Error: SerialException: 'device reports readiness to read but returned no data (device disconnected or multiple access on port?)' @ comm.py:_readline:2739)"
2019-10-14 15:56:29,501 - octoprint.plugins.portlister - INFO - on_port_created connection_options {'portPreference': None, 'autoconnect': True, 'baudrates': [250000, 230400, 115200, 57600, 38400, 19200, 9600], 'ports': ['/dev/ttyACM0', 'VIRTUAL'], 'baudratePreference': 250000}
2019-10-14 15:56:29,503 - octoprint.plugins.portlister - INFO - Checking if /dev/ttyACM0 is in ['/dev/ttyACM0', 'VIRTUAL']
2019-10-14 15:56:29,511 - octoprint.plugins.portlister - INFO - autoconnect_delay 20
2019-10-14 15:56:41,566 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature
2019-10-14 15:56:49,525 - octoprint.plugins.portlister - INFO - do_auto_connect
2019-10-14 15:56:49,528 - octoprint.plugins.portlister - INFO - realpath match
2019-10-14 15:56:49,609 - octoprint.plugins.portlister - INFO - Attempting to connect to AUTO at 250000 with profile '_default'
2019-10-14 15:56:49,683 - octoprint.util.comm - INFO - Changing monitoring state from "Offline" to "Detecting serial port"
2019-10-14 15:56:50,027 - octoprint.util.comm - INFO - Changing monitoring state from "Detecting serial port" to "Opening serial port"
2019-10-14 15:56:50,032 - octoprint.util.comm - INFO - Changing monitoring state from "Opening serial port" to "Connecting"
2019-10-14 15:56:50,046 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-14 15:56:50,960 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-14 15:56:51,268 - octoprint.util.comm - INFO - Changing monitoring state from "Connecting" to "Operational"
2019-10-14 15:56:51,279 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2019-10-14 15:56:51,316 - octoprint.plugins.ipOnConnect - INFO - ipOnConnectPlugin: 10.63.142.13
2019-10-14 15:56:51,355 - octoprint.util.comm - INFO - Printer reports firmware name "Marlin"
2019-10-14 15:56:51,373 - octoprint.util.comm - INFO - Firmware states that it supports temperature autoreporting
2019-10-14 15:56:51,410 - octoprint.util.comm - INFO - Firmware states that it supports emergency GCODEs to be sent without waiting for an acknowledgement first
2019-10-14 15:57:11,615 - octoprint.plugins.navbartemp - INFO - Checking SoC internal temperature

That is an octoprint.log.

Oops- my apologies. This should be the serial log.
Mini2_10_14_19_serial.log (64.8 KB)

Tried this just now (send G0 X10 F6000 and then G0 Y10 F6000) and both worked fine. Looks like when I use the GUI controls in the Octoprint interface that it is sending a G1 command, and that the G0 command moves a lot more distance, i.e., G0 X10 travels a lot more than G1 X10.

Not sure if that is a typo but G0 and G1 are two different gcode commands. If you meant to suggest that G0 X10 and G0 Y10 move different amounts when seen like this:

G28 X Y   # home the X/Y motors
G0 X10    # our 1st move sideways, should be a total of 10mm travel
G0 X0     # return to the origin, should be a total of 10mm travel back
G0 Y10    # our 2nd move front/back, should be a total of 10mm travel

...then let us know.

G0 is the start-from-here sort of command and G1 is the expected move-to-here sort of command (usually associated with extruding).

I'm definitely limited in my knowledge of Marlin, so your differentiation of G0 and G1 explains the what I saw in the printer's behavior. I figured they were different commands but didn't understand why they would move different amounts when it looked like they have the same parameters.

Anyways, any thoughts on next steps or what's causing the error?

Uhm, for the record, in (mainline) Marlin G0 and G1 are exactly the same. As in, one actually just is an alias for the other.

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