RMAN backup is aborted with status code 6

Dear All,

need urgunt assistance below is the output of RMAN backup intigrted with netbackup 7.5

Enviroment info --master solaris 7.5.0.4 /solaris

Media server (Which is backed up )  7.5.0.4 / AIX

Below is the error in RMAN output script

RMAN-03009: failure of backup command on ch01 channel at 05/05/2013 21:45:56
ORA-19506: failed to create sequential file, name="bk_97917_1_814653708", 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
channel ch01 disabled, job failed on it will be run on another channel
RMAN-03009: failure of backup command on ch10 channel at 05/05/2013 21:45:57
ORA-19506: failed to create sequential file, name="bk_97926_1_814653708", 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
channel ch10 disabled, job failed on it will be run on another channel
RMAN-03009: failure of backup command on ch03 channel at 05/05/2013 21:45:58
ORA-19506: failed to create sequential file, name="bk_97919_1_814653708", 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
channel ch03 disabled, job failed on it will be run on another channel
RMAN-03009: failure of backup command on ch05 channel at 05/05/2013 21:45:58
ORA-19506: failed to create sequential file, name="bk_97921_1_814653708", 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
channel ch05 disabled, job failed on it will be run on another channel
RMAN-03009: failure of backup command on ch08 channel at 05/05/2013 21:45:58
ORA-19506: failed to create sequential file, name="bk_97924_1_814653708", 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
channel ch08 disabled, job failed on it will be run on another channel

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Policy details are attached in txt pad

FYI ..daily policy happened yesterday properly.

Expecting prompt assistance .

Thanks