RMAN-05541: no archived logs found in target database

RMAN> DUPLICATE TARGET DATABASE
   FOR STANDBY
   FROM ACTIVE DATABASE
   DORECOVER
   SPFILE
     SET "db_unique_name"="ORCL"
NOFILENAMECHECK;2> 3> 4> 5> 6> 7>
Starting Duplicate Db at 30-JUL-13
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=19 device type=DISK
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 07/30/2013 02:45:30
RMAN-05541: no archived logs found in target database

REMEDY is generate archive logs at Primary database