Database Software

Hi I am trying to create a clone database using rman and the duplicate script got all the way the almost the final phase but it is failing on the alter clone database open resetlogs command with the following error?
RMAN> alter clone database open resetlogs;

RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of alter db command at 05/21/2009 12:15:50
RMAN-06136: ORACLE error from auxiliary database: ORA-01152: file 1 was not restored from a sufficiently old backup
ORA-01110: data file 1: '+DATA_DG/pefdb/datafile/system.375.687392095'

Is there anything I can do to get the database to open? I don;t get it I backed up the target database after the instance had been restarted and then I also ran an archive log backup prior to running the duplicate. All of the data files restored and all of the archive logs restored so I am confused at this errors?
Any help is greatly appreciated and I would like to avaoid having to resotre the file down again as it took 12 hours... And also I don;t know what I would do differently if I were to have to backup the target database yet again I don;t know what would be different?
Thanks.