Unable to use OctoPrint

Hi,

Just managed to get my Taz6 & Archim2 running with DO, my word is it quiet! However when I try to connect to the printer using OctoPrint v1.6.1, it connects but a couple of seconds later it disconnects and the printer reboots. The terminal in OctoPrint shows:

Send: M876 P1
Recv: ok P15 B4
Send: M20
Recv: Begin file list
Recv: /DOCUME~1/MANUAL/SOURCE/MANUAL.GST 363
Unexpected error while reading serial port, please consult octoprint.log for details: SerialException: 'device reports readiness to read but returned no data (device disconnected or multiple access on port?)' @ comm.py:_readline:3860
Please see https://faq.octoprint.org/serialerror for possible reasons of this.
Changing monitoring state from "Operational" to "Offline after error"
Connection closed, closing down monitor

Any idea of what is up?

Thanks

Looks like this was caused by something on the SD card, everything works fine when I remove the SD card. Will have a look what’s on the SD card, but I think it has the standard files from Lulzbot and a handful of my gcode files on it.