Plex has not updated their add-on to support the newer version of Python OSMC is currently running. The following thread outlines options to get it working either with patched versions you manually install or alternative Plex add-ons.
Plex has not updated their add-on to support the newer version of Python OSMC is currently running. The following thread outlines options to get it working either with patched versions you manually install or alternative Plex add-ons.