SQL2062N An error occurred while accessing media Reason code: "11"

Hi ,

I am getting below error for my TDP SAP backup.

Backom log:
------------------------- Tue Mar 5 22:19:01 2013 -------------------------
BKI8806I: Data Protection for SAP(R) - BackOM 6.1.0.2 (367T) Apr 24 2009
BKI2027I: Using TSM-API version 5.5.1.13 (compiled with 5.3.0.0).
BKI8652I: DB2 version 'SQL09055' with 64 bits detected.
BKI8511I: The command is: -c b_db -a FS -B 12 -S 4 -P 8 -e /db2/FS/dbs/initFS_WEEKLY.utl -O -L
BKI8637I: Full online backup of 'FS' started ...
BKI8643I: Using vendor library at '/usr/tivoli/tsm/tdp_r3/db264/libtdpdb264.a' ...
BKI8639I: Including log files in backup image ...
BKI8654I: Using an autonomic buffer size with 12 buffers ...
BKI8641I: Using 4 session(s) ...
BKI8642I: Using a degree of parallelism of 8 ...
SQL2062N An error occurred while accessing media
"/usr/tivoli/tsm/tdp_r3/db264/libtdpdb264.a". Reason code: "11".
BKI8548I: Elapsed time: 3 sec
BKI8634E: Backup command failed due to an error.
BKI8512I: Return code is: 605


aix server:db2fs 4> env |grep DSMI
DSMI_CONFIG=/db2/FS/dbs/dsm_weekly.opt
DSMI_DIR=/usr/tivoli/tsm/client/api/bin64
DSMI_LOG=/db2/FS/dbs

Please help me to resolve this.