Perform an on demand overwrite. Go to this link. It will show you how to do it.
Solution : Perform an On Demand Overwrite
NOTE: The "Immediate Job Overwrite Failed" message occurs when a job is in the system and it cannot be automatically securely overwritten by Immediate Image Overwrite routine due to a power loss or unexpected system reboot, or from some other error that prevents overwrite of active jobs. Data may be left on the hard disk that was not securely erased.