What steps are takeing place? I have seen on some specific HP systems that the image will be created or deployed but the console never gets the all clear from the client and so will report a -99.
If you couls share the details about the job you are performing and the details of the error and steps of the task up to the 99 error. If you are still using the default F drive as noted by Ian consider changind to a later letter.
https://support.symantec.com/en_US/article.TECH231478.html