R12.1.3 : patch error

Hi,
Error when applying patch.

In the adwork001.log we can see
----------------------------
Index AP_SUPPLIERS_N9 does not exist in AP.

CREATE INDEX "AP"."AP_SUPPLIERS_N9" ON "AP"."AP_SUPPLIERS" (UPPER("SEGMENT1"))
 PCTFREE 10 INITRANS 11 MAXTRANS 255 COMPUTE STATISTICS
 STORAGE(INITIAL 16384 NEXT 131072 MINEXTENTS 1 MAXEXTENTS 2147483645
 PCTINCREASE 0 FREELISTS 4 FREELIST GROUPS 4 BUFFER_POOL DEFAULT)
 TABLESPACE "APPS_TS_TX_IDX"
Start time for statement above is Tue Nov 05 10:42:02 GMT 2013
A Differnt index with same column name exists
==========================================================
Done calling the utility function. Return Code = [1] TimeStamp = [Tue Nov 05 10:42:06 GMT 2013]
Updating task with status 1

AD Worker error:
The utility FndXdfCmp returned error for the above task.