The backup job log has the following RMAN output.
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of backup command at 01/28/2012 17:40:35
RMAN-10015: error compiling PL/SQL program
RMAN-10033: error during compilation of job step 2: ORA-00603: ORACLE server session terminated by fatal error
ORA-04030: out of process memory when trying to allocate 200 bytes (PL/SQL DIANA,LISIMA: Add cells)
Recovery Manager complete."
This is an memory error on the oracle server when running the RMAN backups.The oracle technical support should be contacted to resolve this issue.