"Manual scheduled focusing is not supported. Run autofocus process before trying again."
This stalls the Scheduler when no focus frame was ever retrieved before starting it. It is solved by running an autofocus, as the message says. But there is nothing obvious that would prevent that autofocus from being run automated.
It might be that in the past, the focus star could not be selected automatically, hence manual action was required, but it is not clear.
The other problem is that the abort doesn't get back to the Scheduler. I can take care of that particular point.
Before I plan to remove or tweak that test, anyone has an idea of why this message is there? Snippet was added by M. Fulbright in July 2017, I'll send a mail eventually.