ORA-27211: Failed to load Media Management Library

After Upgrading DB from 10.1.0.04 to 10.2.0.3 rman restore was failing.
We were trying to restore TEST from PROD which was recently upgraded to 10.2.0.3.
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We were receiving the below error when trying to run the rman duplicate command.
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RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of allocate command on ch00 channel at 08/01/2007 04:47:57
RMAN-10035: exception raised in RPC:
ORA-19624: operation failed, retry possible
ORA-19554: error allocating device, device type: SBT_TAPE, device name:
ORA-27211: Failed to load Media Management Library
ORA-06512: at "SYS.X$DBMS_BACKUP_RESTORE", line 173
RMAN-10031: RPC Error: ORA-19624 occurred during call to DBMS_BACKUP_RESTORE.DEVICEALLOCATE

RMAN> **end-of-file**
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CAUSE:
RMAN was not able to recognise the TAPE device.
Solution:
When we Install a TAPE there are certain libraryfiles which must be loaded or read by RMAN to recognize the tape device.
For example in windows if an utility is not installed properly then we get the error saying unable to locate the .dll etc.
The customer was using VERITAS NET backup which on instaling creates library files which must be available to RMAN to recognose the device.
These are the three libraries
libobk.sllibobk.sl64libobk.so
Sine RMAN is a ORACLE utility searches these libraries inside ORACLE_HOME/lib or lib32 based on version(32or64)
Create the below links so that rman can recognise the Tape device before starting backup or recovery
oracle@hposi00[prod] > ls -l libobk*lrwxr-xr-x 1 root sys 34 Jul 29 21:55 libobk.sl -> /usr/openv/netbackup/bin/libobk.sllrwxr-xr-x 1 root sys 36 Jul 29 21:55 libobk.sl64 -> /usr/openv/netbackup/bin/libobk.sl64lrwxr-xr-x 1 root sys 34 Jul 29 21:56 libobk.so -> /usr/openv/netbackup/bin/libobk.sooracle@hposi00[prod] > pwd/u01/app/oracle/102/lib
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