The current version of PM4K in the 'Don't Panic' repo is not compatible with newer Python versions/libs. The workaround is to use the latest add-on source from https://github.com/pannal/plex-for-kodi/tree/develop_kodi21 as this contains fixes (and more). You need to download the source files from GitHub as a zip file, then unzip and rename the extracted folder to "script.plexmod" before re-zip'ing the folder. The zip file is then in a format that will install to Kodi (with install-from-zip allowed). If you only download the source and rename the original zip file the install to Kodi will fail.
Thank you !!!!
Was just setting up a new rpi5, and couldn't get Plex nor PM4K from the official repositories working ... digged through the logfiles but a whole bunch of errors that didn;t seem easily solvable ... then I google and found your post ... 5 minutes later, PM4K up and running !
