Oracle Database Discussions

I can´t recreate my physical standby.
It worked in the past.

Now I reinstalled the 3 standbyclients.
Copied the spfile from the primary - modified the entries and did a rman backup.
But when issuing the duplicate database command - it comes up with the error above

SPFILE standyby db:
*.db_file_name_convert='+DATA/prim/','+DATA/stdy/','+RECOVERY/prim','+RECOVERY/stdy'
*.log_file_name_convert='+DATA/prim/','+DATA/stdy/','+RECOVERY/prim','+RECOVERY/stdy'

--------------------------------------

Starting restore at 15-APR-10
using channel ORA_AUX_DISK_1

channel ORA_AUX_DISK_1: starting datafile backupset restore
channel ORA_AUX_DISK_1: restoring control file
channel ORA_AUX_DISK_1: reading from backup piece /oracle/stage/33lb65n2_1_1
channel ORA_AUX_DISK_1: restored backup piece 1
piece handle=/oracle/stage/33lb65n2_1_1 tag=TAG20100415T102434
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:11
output filename=+REDO1/stdy/controlfile/current.262.716293055
output filename=+REDO2/stdy/controlfile/backup.262.716293055
Finished restore at 15-APR-10

sql statement: alter database mount standby database
released channel: ORA_AUX_DISK_1
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 04/15/2010 10:31:46
RMAN-05501: aborting duplication of target database
RMAN-05001: auxiliary filename DATA/prim/datafile/system.262.715097535 conflicts with a file used by the target database+
RMAN-05001: auxiliary filename DATA/prim/datafile/sysaux.263.715097499 conflicts with a file used by the target database+
RMAN-05001: auxiliary filename DATA/prim/datafile/undotbs3.269.710521021 conflicts with a file used by the target database+
RMAN-05001: auxiliary filename DATA/prim/datafile/undotbs2.270.710521021 conflicts with a file used by the target database+
RMAN-05001: auxiliary filename DATA/prim/datafile/example.272.710521021 conflicts with a file used by the target database+
RMAN-05001: auxiliary filename DATA/prim/datafile/users.268.710521021 conflicts with a file used by the target database+
RMAN-05001: auxiliary filename DATA/prim/datafile/sysaux.273.710521021 conflicts with a file used by the target database+
RMAN-05001: auxiliary filename DATA/prim/datafile/undotbs1.271.710521021 conflicts with a file used by the target database+
RMAN-05001: auxiliary filename DATA/prim/datafile/system.264.710521021 conflicts with a file used by the target database+