Hey all,
i know this topic is quite old, but i had exactly the same errors (after an upgrade to revive 5.0.0) and wasn't able to find a solution until now. Because of this i want to share here, if someone else in the future has the same problems. So here is the super simple solution that worked for me instantly:
Create the folder /var/plugins/DataObjects/ inside your adserver folder.
I hope this works for everyone else too ?