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Check the location of you control file. If it not where you think is should be Oracle will throw this error.
Make sure you use nofilenamecheck in the duplicate command.
Have also seen this error caused by typos in db_file_name_convert and log_file_name_convert
ORA-17628, ORA-19505 during RMAN DUPLICATE FROM ACTIVE [ID 1331986.1]
How to Perform 11G Rman Duplicate From Active database on Same Server [ID 1359333.1]
Edited by: mseberg on Oct 9, 2012 5:49 AM
also if this is a newly created cluster where you used role separation and you never created a DB yet, make sure that you can connect as sysdba to the ASM instance (from the DB Home) as the oracle user creating the DB.