I am also getting the error "Value cannot be null. (Parameter 'returnType')" on the latest release. I tried rolling back to several different previous versions with no luck.
I also see this error when checking the logs:
2022-07-02 10:29:38,932 DEBG 'start-script' stdout output:
[Fatal] ProwlarrErrorPipeline: Request Failed. GET /api/v1/indexer
What can I do to fix this? Thanks!