Environment
Retain (all versions)
Situation
When creating a new job within the Retain Server after clicking Save Changes an error pops up: 
Resolution
This errors means that the job that is being created has not been completely filled out.
You must have a Profile, Schedule and a Worker selected within the Core Settings tab of the job before saving changes.
Also you must have a post office selected or a user selected in the Mailbox tab in order to proceed.
Additional Information
This article was originally published in the GWAVA knowledgebase as article ID 1411.