SCSI problem - HP storageworks ultranium 448

[Irma Dana]

This log captured from syslog related to SCSI problem :

ALERT] Driver detected a software downgrade.
May 18 16:02:00 SOOSRV01 vmunix: sasd: The current driver version is unsupported
May 18 16:02:00 SOOSRV01 vmunix: sasd: for the Serial SCSI HBA at hw path 0/1/1/0.
May 18 16:02:00 SOOSRV01 vmunix: sasd: Please install the latest SerialSCSI-00 depot ASAP

Has anyone experienced this problem? If so, kindly share your solution.

Thanks and regards,

[Irma Dana]

Additional to previous posting :

Server type : HP Rx2660
OS : HPUX 11i v2

And tape drive type :
HP Ultrium 448 with 1U mount

Thanks for all attention and need your help