seems the enclosure plugin has not been updated for OctoPrint 1.4.x
in the PrintDone event, it's still trying to use file which is deprecated
it should be using name to get the filename
without this change it throws an error:
2020-08-28 15:50:27,119 - octoprint.plugin - ERROR - Error while calling plugin enclosure Traceback (most recent call last): File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint/plugin/__init__.py", line 230, in call_plugin result = getattr(plugin, method)(*args, **kwargs) File "/home/pi/oprint/local/lib/python2.7/site-packages/octoprint_enclosure/__init__.py", line 1573, in on_event file_name = os.path.basename(payload["file"]) KeyError: 'file'