RMAN-03009 ORA-19554 ORA-27211

I had the following error when i was trying to add a new ORACLE database backup of an HP-UX client to Data Protector.

RMAN-00571: ===========================================================
RMAN-00569: ====== ERROR MESSAGE STACK FOLLOWS =======
RMAN-00571: ===========================================================
RMAN-03009: failure of allocate command on DP_TEST channel at 01/22/2009 08:54:22
ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-27211: Failed to load Media Management Library
Recovery Manager complete.

Problem is about linking the "libob2oracle8_64bit.so" file in DP library directory to oracle library directory. following softlink create command fixes the problem:

cd $ORACLE_HOME/lib
ln -s /opt/omni/lib/libob2oracle8_64bit.so libobk.so