I received this error this morning via email regarding a user, however, all research I've done says this error happens when Salesforce flags the user as inactive/is deactivated. This user is not inactive. I have confirmed his account is active and he can log in. Any thoughts?
The error is due to an inactive owner on an account - the batch job is trying to update account fields with soft credit summary values. You should run a report on accounts owned by inactive users.