Issues after udating / webinterface Software Failure

Dear All,
I'm sorry I tried to update my omv system via System / Update Management / Updates and got an error message by that.
After a reboot omv started, but I got problems with the webinterface - most pages keep getting me a "software failure message".
I can get into the dashboard and System and see the version 6.9.11-3
I can't get into Network, Storage, Services, Users, or Diagnostics ...
Plex running in a Docker seams to be up and running....

What can I do?
Thanks for your help / hints in advance

After reading the "Solutions to common problems" a second time after posting this thread here.....
I cleared the cache and for the moment everything looks good.
I'm sorry for this thread and thankful for your reminder macom