RMAN :: Duplicate Database On Another Oracle Server?

i am trying to duplicate database on another oracle server. i am getting following errors when i use command in rman orapwd was created on original /source/ db and transferred to destination server.

rman auxiliary sys/pwd@ORA

Recovery Manager: Release 11.2.0.1.0 - Production on Tue Oct 2 02:37:51 2012
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connected to auxiliary database: ORA (not mounted)
RMAN> duplicate database to "ora" backup location "O:ackup";
Starting Duplicate Db at 02-OCT-12

contents of Memory Script:
{
sql clone "create spfile from memory";
}
executing Memory Script

sql statement: create spfile from memory
contents of Memory Script:
{
shutdown clone immediate;
startup clone nomount;
}
executing Memory Script

Oracle instance shut down

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 10/02/2012 02:38:36
RMAN-03015: error occurred in stored script Memory Script
RMAN-04006: error from auxiliary database: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor

RMAN>

when i try to reconnect to rman it throws:

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00554: initialization of internal recovery manager package failed
RMAN-04006: error from auxiliary database: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor

i have to startup in nomount again

ORARCLE_SID is set to ora

backup of db was created from source db by:

RMAN> run{
2> configure controlfile autobackup format for device type disk to 'd:/backup/%F';
3> configure controlfile autobackup on;
4> allocate channel d1 type disk;
5> backup tag FULL_DB format 'd:/backup/db_%t_%s.bk' (database);
6> release channel d1;
7> }