Okay, if you do a search on this forum you'll find LOTS of information on this issue.
Let me hit the high points....
You are doing backups allowing append but not overwrite. So, the backup appends to the end of an almost full tape. It can not overwrite the tape because part of the backup is already on it. So you need to put in a second tape. Period.
Check your Backup Exec job logs (right click on the job and select Job History) and the Windows Event Viewer logs for any error messages.
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