error Call to undefined method SermonspeakerViewSermon::getDocument()

That error message is something coming from Joomla itself. I can't say if that is an issue or not.

The database error you see from SermonSpeaker is something you can ignore. This comes from some very old SQL files which I will delete with the next update. Then the error should be gone.

Thanks again for your support Thomas, this is greatly appreciated!