Cannot Start Print


What is the problem?
I connect OK to Printer
I upload print TO OCTOprint/pi [not SD Card]
I go to print the file [any file]
I get this error:
'Offline: TypeError: 'must be string without null bytes, not str' @'

SCREENSHOTS & Log File here:

What did you already try to solve it?
Ensure everything is up-to-date softeare-wise

Additional information about your setup (OctoPrint version, OctoPi version, printer, firmware, octoprint.log, serial.log or output on terminal tab, ...)
OCTOprint worked fine till I updated...
I get this on all 6 of my OCTOprint to FFCP's
FlashForge Creator Pro 2015
OctoPrint 1.3.6 running on OctoPi 0.13.0

Installed Plugins
Name Actions
Announcement Plugin
Announcements all around OctoPrint
AGPLv3 Gina Häußge
Core Wizard
Provides wizard dialogs for core components and functionality
AGPLv3 Gina Häußge
CuraEngine (<= 15.04)
Adds support for slicing via CuraEngine versions up to and including version 15.04 from within OctoPrint
Homepage AGPLv3 Gina Häußge
Makes the OctoPrint instance discoverable via Bonjour/Avahi/Zeroconf and uPnP
Homepage AGPLv3 Gina Häußge
GPX (2.6.2)
Emulates the gcode printer protocol by translating to/from x3g.
Homepage AGPLv3 Mark Walker
OctoPi Support Plugin
Provides additional information about your OctoPi instance in the UI.
AGPLv3 Gina Häußge
Plugin Manager
Allows installing and managing OctoPrint plugins
Homepage AGPLv3 Gina Häußge
Print History Plugin (1.2)
Saves filename, print time and filament usage for each print
Homepage AGPLv3 Jarek Szczepanski
Software Update
Allows receiving update notifications and performing updates of OctoPrint and plugins
Homepage AGPLv3 Gina Häußge
Virtual Printer
Provides a virtual printer via a virtual serial port for development and testing purposes
AGPLv3 Gina Häußge, based on work by Daid Braam


Durr Me...
It’s been a while :slight_smile:
New slicer not providing .gcode files only .x3g


Well, actually, this GPX plugin I have always had lets you print from .x3g files, so I guess my original Topic here remains an error ...? :frowning:


So for my FlashForge Creator Pro's 2014,2015,2016 i are these GPX settings AOK?
GPX Setting Screenshot 01
GPX Setting Screenshot 02


I checked again and there was a new GPX update and all now seems AOK FYI :slight_smile:


... nope, I just cannot get .x3g files to print any more :frowning:


I'm fairly sure that I remember @markwal saying that the plugin doesn't support printing x3g files and you need to slice to gcode.


Thanks Gina,

I'm sure I use to be able to, I see old .x3g files form last year I printed with ... never mind then ...


This is correct. The plugin only translates from gcode to x3g. It can't send x3g untranslated, we'd need a different mixin or hook to do that.

However, you can (must) print x3g if from the printer's SD card which is why I show them in the list.