RMAN Backup not working with NT Backup

Hi EE

I have a script that is called by NeTbackup (symantec) and uses rman to backup oracle database hosted on redhat linux server to a backup disk on the netbackup server.

The scripts are all good as it was working before as well as the Netbackup. However recently it only back up partially and now it fails to backup as shown below.

I have checked the connection from the Netback up and it is getting to the Linux server and vice-versa.

Any help most appreciated.

============error log====

input archived log thread=2 sequence=4630 RECID=9646 STAMP=782982729
input archived log thread=2 sequence=4631 RECID=9647 STAMP=782982837
input archived log thread=2 sequence=4632 RECID=9649 STAMP=782982920
input archived log thread=1 sequence=5019 RECID=9651 STAMP=782999813
channel ch00: starting piece 1 at 20-MAY-12
released channel: ch00
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ch00 channel at 05/20/2012 01:32:20
ORA-19506: failed to create sequential file, name="al_804_1_783739003", parms=""
ORA-27028: skgfqcre: sbtbackup returned error
ORA-19511: Error received from media manager layer, error text:
   VxBSACreateObject: Failed with error:
   Server Status:  Communication with the server has not been initiated or the server status has
not been retrieved from the serve

RMAN> RMAN>

Recovery Manager complete.