NDMP tape backups are falling with 96 Error

Hello Team,

We have recently change the Drives which are faulty

Those drives are Connected to ACSLS library make those as NDMP drives

and After changing the Drives , while configuring the Drives numbers hasbeen channged

No backups are happening from that point , always gettin 96 erros even enough no.of tapes availble in the pool

MAster server - 6.5.6 - south-nbumast-01

client - despina ( filer )

Do you need any othere details please let me know

Its very critical backups whch are not running foem couple of months

Version of netbackup 6.5.6

Thanks & Regards

Virankumar