Hello everybody,
at first, thanks for the good work in the community.
Second, surprise, I also have a problem. 
After a fresh installation of OMV and the autoshutdown plugin, the following error was displayed at plugin start.
Fehler #0:
OMV\Json\SchemaValidationException: : Missing 'required' attribute 'uphours_begin'. in /usr/share/php/openmediavault/json/schema.inc:625
Searching the forum returned a hit, but the problem was magically solved. (Link: Autoshutdown unable to activate)
Reinstalling omv and only plugin, did not solve the problem.
Any suggestions?
CU
Mini
Specs:
Error:
Installation:
. Works!