Hello Friends...
I am usinfg rman while resyncing the catalog i am getting following error .
Can some one help me ?

Sanjay

RMAN> resync catalog;

RMAN-03022: compiling command: resync
RMAN-03023: executing command: resync
RMAN-08512: waiting for snapshot controlfile enqueue
RMAN-08512: waiting for snapshot controlfile enqueue
RMAN-08512: waiting for snapshot controlfile enqueue
RMAN-08512: waiting for snapshot controlfile enqueue
RMAN-08512: waiting for snapshot controlfile enqueue
RMAN-20029: cannot make a snapshot controlfile
RMAN-03026: error recovery releasing channel resources
RMAN-00569: ================error message stack follows================
RMAN-03006: non-retryable error occurred during execution of command: resync
RMAN-07004: unhandled exception during command execution on channel default
RMAN-10035: exception raised in RPC: ORA-00230: operation disallowed: snapshot c
ontrolfile enqueue unavailable
ORA-06512: at "SYS.DBMS_BACKUP_RESTORE", line 1826
RMAN-10031: ORA-230 occurred during call to DBMS_BACKUP_RESTORE.CFILEMAKEANDUSES
NAPSHOT