2019-12-30 17:49:02,584 - 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 2793, in _readline
    ret = self._serial.readline()
  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?)
2019-12-30 17:49:02,605 - octoprint.util.comm - ERROR - Please see https://faq.octoprint.org/serialerror for possible reasons of this.
2019-12-30 17:49:02,610 - octoprint.util.comm - INFO - Changing monitoring state from "Printing from SD" to "Offline (Error: SerialException: 'device reports readiness to read but returned no data (device disconnected or multiple access on port?)' @ comm.py:_readline:2793)"
2019-12-30 17:49:03,314 - octoprint.plugins.tracking - INFO - Sent tracking event print_failed, payload: {'origin': 'sdcard', 'reason': 'error', 'commerror_text': "SerialException: 'device reports readiness to read but returned no data (device disconnected or multiple access on port?)' @ comm.py:_readline:2793", 'file': 'd79e3591e04450430e564f5e7a66ef9ba6e71915', 'elapsed': 280}