Lot of errors with Advanced OpenAdmin

I still have problem with Advanced OpenAdmin. I installed new fresh Suite in accordance with the installation instructions. A few days everything worked ok, but now I have the same problem.

Optimise AOD Index and Perform Lucene Index schedulers are stuck and constantly running, I have a lot of errors like this:

Fatal error: Class ‘AssignGroups’ not found in /home/myhost/public_html/suite/include/utils/LogicHook.php on line 245

Errors occur when I try to create Contracts, delete User in Admin and so on.

I like Suite but but I am disappointed at the same time i think to come back again on Sugar who has worked without a single error on the same hosting.

I will try one more thing, I will try SuiteCRM on VPS