# Pastebin bIYBIY6m
sqlalchemy.exc.InvalidRequestError: When initializing mapper mapped class CustomRecording->recording, expression 'RecordingFirstReleaseDate' failed to locate a name ('RecordingFirstReleaseDate'). If this is a class name, consider adding this relationship() to the <class 'sir.schema.modelext.CustomRecording'> class after both dependent classes have been defined.