NBU备份oracle报错，请各位帮忙看看

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BCDOC1b:/usr/openv # vi hot_database_backup_CBPDB1_SBCDOC1B.sh.out
channel ch00: SID=822 device type=SBT_TAPE
channel ch00: Veritas NetBackup for Oracle - Release 7.0 (2010010419)

allocated channel: ch01
channel ch01: SID=820 device type=SBT_TAPE
channel ch01: Veritas NetBackup for Oracle - Release 7.0 (2010010419)

sent command to channel: ch00
sent command to channel: ch01

Starting backup at 26-APR-12
channel ch00: starting incremental level 0 datafile backup set
channel ch00: specifying datafile(s) in backup set
input datafile file number=00005 name=/dev/vx/rdsk/vgdata/lvworkdbs1
input datafile file number=00001 name=/dev/vx/rdsk/vgora/lv_system
input datafile file number=00003 name=/dev/vx/rdsk/vgora/lv_undo
channel ch00: starting piece 1 at 26-APR-12
channel ch01: starting incremental level 0 datafile backup set
channel ch01: specifying datafile(s) in backup set
input datafile file number=00006 name=/dev/vx/rdsk/vgdata/lvworkdbs2
input datafile file number=00002 name=/dev/vx/rdsk/vgora/lv_sysaux
input datafile file number=00004 name=/dev/vx/rdsk/vgora/lv_user
channel ch01: starting piece 1 at 26-APR-12
RMAN-03009: failure of backup command on ch01 channel at 04/26/2012 11:32:57
ORA-19513: failed to identify sequential file
ORA-27206: requested file not found in media management catalog
continuing other job steps, job failed will not be re-run
released channel: ch00
released channel: ch01
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ch00 channel at 04/26/2012 11:33:42
ORA-19513: failed to identify sequential file
ORA-27206: requested file not found in media management catalog

RMAN> RMAN>

Recovery Manager complete.

Script /usr/openv/hot_database_backup_CBPDB1_SBCDOC1B.sh
==== ended in error on Thu Apr 26 11:33:42 MYTST 2012 ====