Failed inventories

I have been having bad times with latest NW 7.3.x.

In the setup, Windows 2003 32 bit, NW 732 Jumbo 11. I have the problem for the last 15-20 days. IF I remove a cartridge form the Autoloader and run inventory for that slot, I get the errors:

05/08/07 19:51:07 nsrd: [Jukebox `juke', operation 7]. Initiated operation `operation: "Inventory"; operation device: "\\.\Tape0"; operation slots: "3-3"; operation task: "verify during inventory"; '.
05/08/07 19:51:09 nsrlcpd #1: Jukebox error: Jukebox:juke access:scsidev@2.5.1 failed:MOVE MEDIUM key:5 status:CHECK CONDITION UNKNOWN, Medium Source Element Empty

05/08/07 19:51:10 nsrmmgd: lcpd 1 at host ggnbkp01.airwidesolutions.com reported error 'Jukebox:juke access:scsidev@2.5.1 failed:MOVE MEDIUM key:5 status:CHECK CONDITION UNKNOWN, Medium Source Element Empty
' for the command `4'.
05/08/07 19:51:10 nsrd: [Jukebox `juke', operation # 7]. Jukebox:juke access:scsidev@2.5.1 failed:MOVE MEDIUM key:5 status:CHECK CONDITION UNKNOWN, Medium Source Element Empty

05/08/07 19:51:10 nsrmmgd: Jukebox:juke access:scsidev@2.5.1 failed:MOVE MEDIUM key:5 status:CHECK CONDITION UNKNOWN, Medium Source Element Empty


In these messages, it had shown the that the slot is empty which is correct but then it ends up with RED signal in operations, error in logs and continues to show the tape in the slot.

Any clues please.