Hello,
The alert was reported because VERITAS Backup Exec (tm) told the robotic library to move media from a robotic library slot to a drive and the drive already contains media. The drive state has been set to offline. Eject (remove) media from the drive and then re-inventory (scan) the robotic library.
you may also configure backup exec to respond automatically to alerts :
http://support.veritas.com/docs/192055
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