After taking a online back I am trying to validate the backup set , and am getting the following error. The backup set is still in the directory where it was orignally created.

Is there something I am missing here...

RMAN> run {
2> allocate channel c1 type disk;
3> validate backupset 2;
4> }

RMAN-03022: compiling command: allocate
RMAN-03023: executing command: allocate
RMAN-08030: allocated channel: c1
RMAN-08500: channel c1: sid=9 devtype=DISK

RMAN-03022: compiling command: validate
RMAN-03026: error recovery releasing channel resources
RMAN-08031: released channel: c1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure during compilation of command
RMAN-03013: command type: validate
RMAN-06004: ORACLE error from recovery catalog database: RMAN-20215: backup set
not found
RMAN-06159: error while looking up backup set