The BBJobUser account hadn't been added as an application user in BBECRM. Once added the error cleared and the job ran successfully.

Steps to add the BBJobUser account to BBECRM:

1. Administration functional area > Security > Application Users
2. Click Add
3. Supply the domain name and User name
4. Click Save
5. Go to this user
6. Click “Grant system administrator” under Tasks on the left