DPX error code : 1401

[Taohung]

OS : RHEL5.5 x64 (2.6.18-194.3.1.EL5)
DL785G6
HP LTO-4 1/8 Autoloader SCSI
HP Single Channel Ultra320 PCI-E SC11Xe Host Bus Adapter 412911-B2
Data Protector Express 4.0 SP1

When I run a job , DPX report error code 1401.
I find a HP troubleshooting website => http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=1144272&prodTypeId=12169&objectID=c02057009

I don't have Tape Library LTO-4 Encryption Kit.

Please , Can everyone have good idea ?
Thank you ..