RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 04/11/2012 14:31:49
RMAN-05541: no archived logs found in target database

For this I had to do a logswitch on the primary.

SQL> alter system switch logfile;

System altered.