Can't publish business rules in 2016 - error 300

Hi

New to MDS, and am now playing around with 2016.

I am getting an error when trying to do "publish all" when managing business rules.

The error occurs both when I have created a new rule and when I try to delete it(having it in "Deletion pending" state).

The error I get is:

"300 : A database error has occurred. Contact your system administrator. "

Does anyone know what the actual problem can be or where I can find more info about the error codes for MDS?

Thanks in advance!