AIX server backup failed with "DDRInstance::Invoke - ddrmgr write failure..."

Hello all ,

AIX server whcih is backing up data to Datadomain through avamar is failing with the following error. PLease suggest me your ideas for this error...: Avamar version 7.1. DD- 5.5.

LOGS:

2015-03-24 20:25:27 avtar Error <16709>: DDRInstance::Invoke - ddrmgr write failure result code: 5057
2015-03-24 20:25:27 avtar Warning <18133>: Calling DDR_WRITE returned result code:(5057) File handle is stale message:DDRIO_Write::WriteToDDR: ddp_write failed
[6684838] [5912] Tue Mar 24 20:25:27 2015
ddp_write() failed Offset 5234382672, BytesToWrite 262144, BytesWritten 0 Err: 5057-File handle is stale
[6684838] [5912] Tue Mar 24 20:25:27 2015
ddp_write() failed Offset 5234382672, BytesToWrite 262144, BytesWritten 0 Err: 5057-File handle is stale
[6684838] [6169] Tue Mar 24 17:00:40 2015
ddp_stat() failed, Path avamar-1417722796//STAGING/58f9101c87c30f92e78422e24349d1356db23ef5/BACKUP-02CDC26B143EA6C0F70A3D1C4838DAC0090C4C2D/container.1.cdsf.trace, Err: 5004-nfs lookup failed (nfs: No such file or directory)
[6684838] [5912] Tue Mar 24 17:00:04 2015
ddp_stat() failed, Path avamar-1417722796//STAGING/58f9101c87c30f92e78422e24349d1356db23ef5/BACKUP-02CDC26B143EA6C0F70A3D1C4838DAC0090C4C2D/container.1.cdsf, Err: 5004-nfs lookup failed (nfs: No such file or directory)
[6684838] [2314] Tue Mar 24 17:00:03 2015
ddp_mkdir() failed, Path avamar-1417722796/cur/58f9101c87c30f92e78422e24349d1356db23ef5, mode 511, Err: 5056-nfs mkdir failed (nfs: File already exists)
2015-03-24 20:25:27 avtar Error <0000>: sendData: failed write stream for new file data
[6684838] [5912] Tue Mar 24 20:25:27 2015
ddp_write() failed Offset 5234382672, BytesToWrite 262144, BytesWritten 0 Err: 5057-File handle is stale
[6684838] [5912] Tue Mar 24 20:25:27 2015
ddp_write() failed Offset 5234382672, BytesToWrite 262144, BytesWritten 0 Err: 5057-File handle is stale
[6684838] [6169] Tue Mar 24 17:00:40 2015
ddp_stat() failed, Path avamar-1417722796//STAGING/58f9101c87c30f92e78422e24349d1356db23ef5/BACKUP-02CDC26B143EA6C0F70A3D1C4838DAC0090C4C2D/container.1.cdsf.trace, Err: 5004-nfs lookup failed (nfs: No such file or directory)
[6684838] [5912] Tue Mar 24 17:00:04 2015
ddp_stat() failed, Path avamar-1417722796//STAGING/58f9101c87c30f92e78422e24349d1356db23ef5/BACKUP-02CDC26B143EA6C0F70A3D1C4838DAC0090C4C2D/container.1.cdsf, Err: 5004-nfs lookup failed (nfs: No such file or directory)
[6684838] [2314] Tue Mar 24 17:00:03 2015
ddp_mkdir() failed, Path avamar-1417722796/cur/58f9101c87c30f92e78422e24349d1356db23ef5, mode 511, Err: 5056-nfs mkdir failed (nfs: File already exists)
2015-03-24 20:25:27 avtar Error <0000>: File handle is stale failed when writing to a file in a container for backup, length 262144 bytes at offset 5234906960, remaining bytes 262144
2015-03-24 20:25:27 avtar FATAL <5352>: MAIN: Unhandled standard exception failed when writing to a file in a container for backup, length 262144 bytes at offset 5234906960, remaining bytes 262144
2015-03-24 20:25:27 avtar Info <9772>: Starting graceful (staged) termination, error reported in nbackmain (wrap-up stage)
2015-03-24 20:25:27 avtar Info <7883>: Finished at 2015-03-24 20:25:27 CDT, Elapsed time: 0003h:25m:26s
2015-03-24 20:25:27 avtar Info <17971>: Errors, cancellation or termination caused the backup to not be posted on the DDR
2015-03-24 20:25:27 avtar Info <12530>: Backup was not committed to the DDR.
2015-03-24 20:25:27 avtar Info <6149>: Error summary: 4 errors: 5352, 16709, 0(2)
2015-03-24 20:25:27 avtar Info <8468>: Sending wrapup message to parent
2015-03-24 20:25:27 avtar Info <5314>: Command failed (4 errors, 2 warnings, exit code 10007: miscellaneous error)