Backup Exec 12.5 - 0x80070057 - One or more arguments are invalid

I have a robotic HP LTO Ultrium-3 Tape Drive connected to a LSI Adapter, Ultra320 SCSI 2000 series (w/1020/1030)(StorPort) in a HP server. Was recieving the following error in backup exec:



In event viewer I was recieving:
The driver detected a controller error on \Device\RaidPort0.



The problem turned out to be disconnecting the SCSI terminator from the tape drive then plugging it back on. This caused the green light on the terminator to light up... weird.