(venv) pi@octobuntu:~/OctoPrint/venv/bin$ octoprint serve
2020-09-11 20:21:37,671 - octoprint.startup - INFO - ******************************************************************************
2020-09-11 20:21:37,675 - octoprint.startup - INFO - Starting OctoPrint 1.4.0
2020-09-11 20:21:37,676 - octoprint.startup - INFO - Starting in SAFE MODE. Third party plugins will be disabled!
2020-09-11 20:21:37,677 - octoprint.startup - INFO - Reason for safe mode: problem during last startup
2020-09-11 20:21:37,678 - octoprint.startup - INFO - ******************************************************************************
2020-09-11 20:21:38,048 - octoprint.util.connectivity_checker - INFO - Connectivity changed from offline to online
2020-09-11 20:21:38,319 - octoprint.startup - INFO - Blacklist processing done, adding 1 blacklisted plugin versions: roomtemp (any)
2020-09-11 20:21:38,345 - octoprint.plugin.core - INFO - Loading plugins from /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins, /home/pi/.octoprint/plugins and installed plugin packages...
2020-09-11 20:21:38,376 - octoprint.plugin.core - INFO - Plugin Pi Support Plugin did not pass check, not loading.
2020-09-11 20:21:39,317 - octoprint.plugins.octoprint.plugins.discovery - INFO - pybonjour is not installed, Zeroconf Discovery won't be available
2020-09-11 20:21:39,350 - octoprint.plugins.errortracking - INFO - Initialized error tracking
2020-09-11 20:21:39,357 - octoprint.plugin.core - INFO - Found 27 plugin(s) providing 14 mixin implementations, 25 hook handlers
2020-09-11 20:21:39,417 - octoprint.server.heartbeat - INFO - Starting server heartbeat, 900.0s interval
2020-09-11 20:21:39,436 - octoprint.server - INFO - Intermediary server started
2020-09-11 20:21:39,438 - octoprint.plugin.core - INFO - Loading plugins from /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins, /home/pi/.octoprint/plugins and installed plugin packages...
2020-09-11 20:21:39,449 - octoprint.plugin.core - INFO - Plugin Pi Support Plugin did not pass check, not loading.
2020-09-11 20:21:39,546 - octoprint.plugin.core - INFO - Found 27 plugin(s) providing 14 mixin implementations, 25 hook handlers
2020-09-11 20:21:39,571 - octoprint.filemanager.storage - INFO - Initializing the file metadata for /media/ext/Octoprint/uploads...
2020-09-11 20:21:39,858 - octoprint.filemanager.storage - INFO - ... file metadata for /media/ext/Octoprint/uploads initialized successfully.
2020-09-11 20:21:39,862 - octoprint.server - INFO - Added new permission from plugin action_command_prompt: PLUGIN_ACTION_COMMAND_PROMPT_INTERACT (needs: u"Need(method='role', value=u'plugin_action_command_prompt_interact')")
2020-09-11 20:21:39,864 - octoprint.server - INFO - Added new permission from plugin announcements: PLUGIN_ANNOUNCEMENTS_READ (needs: u"Need(method='role', value=u'plugin_announcements_read')")
2020-09-11 20:21:39,866 - octoprint.server - INFO - Added new permission from plugin announcements: PLUGIN_ANNOUNCEMENTS_MANAGE (needs: u"Need(method='role', value=u'plugin_announcements_manage'), Need(method='role', value=u'plugin_announcements_read')")
2020-09-11 20:21:39,868 - octoprint.server - INFO - Added new permission from plugin appkeys: PLUGIN_APPKEYS_ADMIN (needs: u"Need(method='role', value=u'plugin_appkeys_admin')")
2020-09-11 20:21:39,869 - octoprint.server - INFO - Added new permission from plugin backup: PLUGIN_BACKUP_ACCESS (needs: u"Need(method='role', value=u'plugin_backup_access')")
2020-09-11 20:21:39,871 - octoprint.server - INFO - Added new permission from plugin logging: PLUGIN_LOGGING_MANAGE (needs: u"Need(method='role', value=u'plugin_logging_manage')")
2020-09-11 20:21:39,873 - octoprint.server - INFO - Added new permission from plugin pluginmanager: PLUGIN_PLUGINMANAGER_MANAGE (needs: u"Need(method='role', value=u'plugin_pluginmanager_manage')")
2020-09-11 20:21:39,874 - octoprint.server - INFO - Added new permission from plugin pluginmanager: PLUGIN_PLUGINMANAGER_INSTALL (needs: u"Need(method='role', value=u'plugin_pluginmanager_install'), Need(method='role', value=u'plugin_pluginmanager_manage')")
2020-09-11 20:21:39,877 - octoprint.server - INFO - Added new permission from plugin printer_safety_check: PLUGIN_PRINTER_SAFETY_CHECK_DISPLAY (needs: u"Need(method='role', value=u'plugin_printer_safety_check_display')")
2020-09-11 20:21:39,878 - octoprint.server - INFO - Added new permission from plugin softwareupdate: PLUGIN_SOFTWAREUPDATE_CHECK (needs: u"Need(method='role', value=u'plugin_softwareupdate_check')")
2020-09-11 20:21:39,879 - octoprint.server - INFO - Added new permission from plugin softwareupdate: PLUGIN_SOFTWAREUPDATE_UPDATE (needs: u"Need(method='role', value=u'plugin_softwareupdate_update')")
2020-09-11 20:21:40,014 - octoprint.plugins.softwareupdate - INFO - Loaded version cache from disk
2020-09-11 20:21:40,602 - octoprint.util.pip - INFO - Using "/home/pi/OctoPrint/venv/bin/python2 -m pip" as command to invoke pip
2020-09-11 20:21:41,183 - octoprint.util.pip - INFO - Version of pip is 20.2.3
2020-09-11 20:21:41,185 - octoprint.util.pip - INFO - pip installs to /home/pi/OctoPrint/venv/lib/python2.7/site-packages (writable -> yes), --user flag needed -> no, virtual env -> yes
2020-09-11 20:21:41,186 - octoprint.util.pip - INFO - ==> pip ok -> yes
2020-09-11 20:21:41,192 - octoprint.plugin.core - INFO - Initialized 14 plugin implementation(s)
2020-09-11 20:21:41,202 - octoprint.plugin.core - INFO - 27 plugin(s) registered with the system:
|  Action Command Prompt Support (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/action_command_prompt
|  Announcement Plugin (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/announcements
|  Anonymous Usage Tracking (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/tracking
|  Application Keys Plugin (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/appkeys
|  Backup & Restore (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/backup
|  Core Wizard (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/corewizard
| !Custom Background (0.10.1) = /home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint_custombackground
|  Discovery (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/discovery
| !DisplayZ (0.1.0) = /home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint_displayz
|  Error Tracking (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/errortracking
| !File Check (2020.8.7) = /home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint_file_check
| !Firmware Check (2020.6.22) = /home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint_firmware_check
| !Floating Navbar (0.3.4) = /home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint_floatingnavbar
| !Fullscreen Plugin (0.0.5) = /home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint_fullscreen
|  Logging (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/logging
|  Login UI (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/loginui
| !OctoPrint-WideScreen (0.1.3) = /home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint_widescreen
|  Plugin Manager (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/pluginmanager
|  Printer Safety Check (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/printer_safety_check
| !PrusaSlicer Thumbnails (0.1.2) = /home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint_prusaslicerthumbnails
| !Python 3 Check (0.1.4) = /home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint_python3plugincompatibilitycheck
| !Remove /dev/ttyS* ports (0.1.0) = /home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint_remove_ttys_ports
| !Resource Monitor (0.2.5) = /home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint_resource_monitor
|  Software Update (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/softwareupdate
| !Tasmota (0.8.14) = /home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint_tasmota
| !Themeify (1.2.2) = /home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint_themeify
|  Virtual Printer (bundled) = /home/pi/OctoPrint/venv/lib/python2.7/site-packages/octoprint/plugins/virtual_printer
Prefix legend: ! = disabled, # = blacklisted, * = incompatible
2020-09-11 20:21:41,299 - octoprint.environment - INFO - Detected environment is Python 2.7.17 under Linux (linux2). Details:
|  hardware:
|      cores: 4
|      freq: 2080.0
|      ram: 8203661312
|  os:
|      id: linux
|      platform: linux2
|  python:
|      pip: 20.2.3
|      version: 2.7.17
|      virtualenv: /home/pi/OctoPrint/venv
2020-09-11 20:21:41,308 - octoprint.server - INFO - Reset webasset folder /home/pi/.octoprint/generated/webassets...
2020-09-11 20:21:41,311 - octoprint.server - INFO - Reset webasset folder /home/pi/.octoprint/generated/.webassets-cache...
2020-09-11 20:21:41,939 - octoprint.cli.server - ERROR - Uncaught exception
Traceback (most recent call last):
  File "/home/pi/OctoPrint/venv/bin/octoprint", line 8, in <module>
    sys.exit(main())
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint/__init__.py", line 615, in main
    octo(args=args, prog_name="octoprint", auto_envvar_prefix="OCTOPRINT")
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/click/decorators.py", line 21, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint/cli/server.py", line 207, in serve_command
    ignore_blacklist)
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint/cli/server.py", line 119, in run_server
    octoprint_server.run()
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint/server/__init__.py", line 608, in run
    sockjs_url="../../static/js/lib/sockjs.min.js"))
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/octoprint/vendor/sockjs/tornado/router.py", line 114, in __init__
    self._sessions_cleanup.start()
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/tornado/ioloop.py", line 1209, in start
    self._schedule_next()
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/tornado/ioloop.py", line 1237, in _schedule_next
    self._update_next(self.io_loop.time())
  File "/home/pi/OctoPrint/venv/local/lib/python2.7/site-packages/tornado/ioloop.py", line 1244, in _update_next
    callback_time_sec *= 1 + (self.jitter * (random.random() - 0.5))
TypeError: unsupported operand type(s) for *: 'EPollIOLoop' and 'float'