Hello,
This problem occurs if the CATALOG that was generated for that tape has become corrupted. To correct this problem, perform the following steps:
1. Locate the tape in the ALL MEDIA section on the MEDIA tab of Backup Exec.
2. Right mouse click on the tape and choose RESTORE.
3. When the RESTORE job window comes up, it will show you the tape is already highlighted on the left pane of the 2 pane window.
4. Right mouse click on the highlighted selection and choose DELETE.
5. Close the RESTORE job window.
6. INVENTORY the tape that the restore selections was removed for and then run a CATALOG job to rebuild the restore selections for that tape. If the backup spanned more than this tape, you will need all of the media available to perform this operation.
Once the CATALOG job is finished, a RESTORE job should be able to be created for the selections from that tape.