Need help with error: Changing monitoring state from "Printing" to "Offline (Error: OverflowError: 'Python int too l  

Need help with error: Changing monitoring state from "Printing" to "Offline (Error: OverflowError: 'Python int too l

I am printing from OctoPrint / Octopi. I have a lot of successful prints, but twice now, the print has stopped unexpectedly after about 30-40 minutes, in the middle of the print. The fans are still running, the bed and nozzle are still heating. Print head stops moving.

I see some errors in the octoprint.log, but I'm not sure what they mean, and a google search doesn't help very much.


2018-11-10 00:43:37,667 - 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 2581, in _readline
ret = self._serial.readline()
File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint/util/comm.py", line 4599, in readline
data += bytearray(self.read(self.in_waiting))
File "/home/pi/oprint/local/lib/python2.7/site-packages/serial/serialposix.py", line 493, in read
buf = os.read(self.fd, size - len(read))
OverflowError: Python int too large to convert to C long
2018-11-10 00:43:37,779 - octoprint.util.comm - INFO - Changing monitoring state from "Printing" to "Offline (Error: OverflowError: 'Python int too large to convert to C long' @ comm.py:_readline:2581)"


Here is the entire log file:


2018-11-09 23:34:51,449 - octoprint.server.heartbeat - INFO - Server heartbeat <3
2018-11-09 23:34:51,460 - octoprint.server - INFO - --- Log roll over detected ---------------------------------------------------
2018-11-09 23:34:51,462 - octoprint.server - INFO - OctoPrint 1.3.9
2018-11-09 23:34:51,483 - octoprint.plugin.core - INFO - 13 plugin(s) registered with the system:
| Action Command Prompt Support (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/action_command_prompt
| Announcement Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/announcements
| Core Wizard (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/corewizard
| CuraEngine (<= 15.04) (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/cura
| Discovery (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/discovery
| ipOnConnect (0.2.0) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_ipOnConnect
| Logging (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/logging
| OctoPi Support Plugin (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/octopi_support
| Plugin Manager (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/pluginmanager
| Printer Safety Check (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/printer_safety_check
| Slic3r (1.1.1) = /home/pi/oprint/local/lib/python2.7/site-packages/octoprint_slic3r
| Software Update (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/softwareupdate
| Virtual Printer (bundled) = /home/pi/oprint/lib/python2.7/site-packages/octoprint/plugins/virtual_printer
2018-11-09 23:34:51,583 - octoprint.environment - INFO - Detected environment is Python 2.7.13 under Linux (linux2). Details:
| hardware:
| cores: 1
| freq: 1000.0
| ram: 388599808
| os:
| id: linux
| platform: linux2
| plugins:
| octopi_support:
| model: Zero W
| revision: 9000c1
| version: 0.15.0PE
| python:
| pip: 9.0.3
| version: 2.7.13
| virtualenv: /home/pi/oprint
2018-11-09 23:34:51,585 - octoprint.server - INFO - ------------------------------------------------------------------------------
2018-11-09 23:35:59,907 - octoprint.util.comm - INFO - Finished in 17389.072 s.
2018-11-09 23:35:59,913 - octoprint.util.comm - INFO - Changing monitoring state from "Printing" to "Finishing"
2018-11-09 23:35:59,920 - octoprint.filemanager.analysis - INFO - Starting analysis of local:Prusa_Adjustable_Spool_Holder-thread_v3_0.2mm_PET_MK3.gcode
2018-11-09 23:35:59,938 - octoprint.filemanager.analysis - INFO - Invoking analysis command: /home/pi/oprint/bin/python2 -m octoprint analysis gcode --speed-x=10200 --speed-y=10200 --max-t=10 --throttle=0.0 --throttle-lines=100 /home/pi/.octoprint/uploads/Prusa_Adjustable_Spool_Holder-thread_v3_0.2mm_PET_MK3.gcode
2018-11-09 23:36:00,118 - octoprint.util.comm - INFO - Changing monitoring state from "Finishing" to "Operational"
2018-11-09 23:49:51,475 - octoprint.server.heartbeat - INFO - Server heartbeat <3
2018-11-09 23:52:28,252 - octoprint.filemanager.analysis - INFO - Analysis of entry local:Prusa_Adjustable_Spool_Holder-thread_v3_0.2mm_PET_MK3.gcode finished, needed 988.33s
2018-11-09 23:58:23,904 - octoprint.util.comm - INFO - Changing monitoring state from "Operational" to "Printing"
2018-11-09 23:58:23,944 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2018-11-10 00:04:51,482 - octoprint.server.heartbeat - INFO - Server heartbeat <3
2018-11-10 00:19:51,497 - octoprint.server.heartbeat - INFO - Server heartbeat <3
2018-11-10 00:34:51,504 - octoprint.server.heartbeat - INFO - Server heartbeat <3
2018-11-10 00:43:37,667 - 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 2581, in _readline
ret = self._serial.readline()
File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint/util/comm.py", line 4599, in readline
data += bytearray(self.read(self.in_waiting))
File "/home/pi/oprint/local/lib/python2.7/site-packages/serial/serialposix.py", line 493, in read
buf = os.read(self.fd, size - len(read))
OverflowError: Python int too large to convert to C long
2018-11-10 00:43:37,779 - octoprint.util.comm - INFO - Changing monitoring state from "Printing" to "Offline (Error: OverflowError: 'Python int too large to convert to C long' @ comm.py:_readline:2581)"
2018-11-10 00:44:57,897 - octoprint.util.comm - INFO - Changing monitoring state from "Offline" to "Opening serial port"
2018-11-10 00:44:57,929 - octoprint.util.comm - INFO - Changing monitoring state from "Opening serial port" to "Connecting"
2018-11-10 00:44:57,964 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2018-11-10 00:44:58,006 - octoprint.util.comm - INFO - Changing monitoring state from "Connecting" to "Operational"
2018-11-10 00:44:58,043 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2018-11-10 00:44:58,122 - octoprint.plugins.ipOnConnect - INFO - ipOnConnectPlugin: 10.0.0.206
2018-11-10 00:44:58,125 - octoprint.util.comm - INFO - Printer reports firmware name "Prusa-Firmware 3.4.1 based on Marlin"
2018-11-10 00:48:16,143 - octoprint.util.comm - INFO - Changing monitoring state from "Operational" to "Printing"
2018-11-10 00:48:16,182 - octoprint.util.comm - INFO - M110 detected, setting current line number to 0
2018-11-10 00:49:34,658 - octoprint.util.comm - INFO - Printer seems to support the busy protocol, telling it to set the busy interval to our "communicationBusy" timeout - 1s = 2s
2018-11-10 00:49:51,516 - octoprint.server.heartbeat - INFO - Server heartbeat <3
2018-11-10 01:04:51,524 - octoprint.server.heartbeat - INFO - Server heartbeat <3

Any advice appreciated!