RMAN Duplicate 11.2 Error I faced on controlfile : RMAN-03002: failure of Duplicate DB command

RMAN Duplicate 11.2 Error - Since Controlfile is restored and not created

Error I got was 

RMAN-03002: failure of Duplicate Db command at 04/08/2012 11:23:07
RMAN-05501: aborting duplication of target database
RMAN-03015: error occurred in stored script Memory Script
RMAN-06026: some targets not found - aborting restore
RMAN-06024: no backup or copy of the control file found to restore

RMAN 11.2 duplicate now RESTORES the backup controlfile to the auxiliary host rather than CREATE it. 

Had to ensure that controlfile backup was available to meet backup time.

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Test to run test before starting duplicate to verify whether there is a valid controlfile backup

RMAN> run {
        set until time "to_date('2013 APR 08 09:28','YYYY MON DD HH24:MI')";
        restore controlfile preview;
      }

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