@Andrew_Rowe please uninstall the built in jrubyscripting addon from OH4 and drop this jar into your addons folder: Release jrubyscripting-oh4.0-0.0.1: [lcn] Add shutter positioning/angle, operating hours counters, tunabl… · jimtng/openhab-addons · GitHub
Then if you still encounter the same error message, please open a separate topic to track it and tag me on it.