I check my backup full and RMAN shows me that is correct

RMAN-08502: set_count=26 set_stamp=495201800 creation_time=28-MAY-03
RMAN-08023: channel t1: restored backup piece 1
RMAN-08511: piece handle=Backup_full_DATABASE_26_1 tag=null params=NULL
RMAN-08098: channel t1: validation complete


But when I try to restore controlfile or database It says
the backup is not valid

RMAN-03002: failure during compilation of command
RMAN-03013: command type: restore
RMAN-03002: failure during compilation of command
RMAN-03013: command type: IRESTORE
RMAN-06026: some targets not found - aborting restore
RMAN-06024: no backup or copy of the controlfile found to restore

How to specified during restore the name
of piece handle = 'Backup_full_DATABASE_26_1'
something like that
run {
allocate channel t1 type 'SBT_TAPE'
parms 'ENV=(NSR_SERVER=toto.com,NSR_DATA_VOLUME_POOL=Default)';
restore controlfile;
release channel t1;
}