How to duplicate Oracle DB to other host.

dear all,
i tried creating the duplicate database to other host:
host name of primary database: pridb
host name of duplicate DB( auxiliary) : auxdb
when i configured the infomation for duplicating database: initaux, oracle net, preparing backups database, archive log all.
when i executed cmd: duplicate target database to auxdb, then occur error the following:
rman>connect target sys/abc@pridb -> success
rman>connect auxiliary sys/abc@auxdb -> success
rman>duplicate target database to auxdb;
RMAN-03002: failure of Duplicate Db command at 06/23/2011 10:19:09
RMAN-03015: error occurred in stored script Memory Script
RMAN-06026: some targets not found - aborting restore
RMAN-06023: no backup or copy of datafile 4 found to restore
RMAN-06023: no backup or copy of datafile 3 found to restore
RMAN-06023: no backup or copy of datafile 2 found to restore
RMAN-06023: no backup or copy of datafile 1 found to restore
i think, may be when aux_channel implement duplicate db, it can not read backups file of primary db.
please tell me , how do.

refer the link:-
http://oracleinstance.blogspot.com/2010/07/rman-03002-failure-of-duplicate-db.html
for duplicate/clone database
refer:-http://oracleinstance.blogspot.com/
http://oracleinstance.blogspot.com/2010/08/disaster-recovery-using-rman-demo.html

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Text description of the illustration sbr81078.gif
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