Std collection Fails in REFRESH_SNAPSHOT

Hi,we are facing some issue in ascp std collection:

1st time we are running it.

-----------------
************************************************************
21-AUG 06:39:37 : Refresh Snapshot process started.
21-AUG 06:39:37 : Application id: 724
21-AUG 06:39:41 : Refresh Snapshot process( Request_ID=27705128) is submitted.
21-AUG 06:39:54 : exiting purge staging table 
21-AUG 06:46:45 :  after calling REFRESH_SNAPSHOT  
21-AUG 06:46:46 : Planning Data Pull Worker( Request_ID=538983) is submitted.
21-AUG 06:46:46 : Planning Data Pull Worker( Request_ID=538984) is submitted.
21-AUG 06:46:46 : Planning Data Pull Worker( Request_ID=538985) is submitted.
21-AUG 09:47:04 : Timeout error.
21-AUG 09:47:04 : User-Defined Exception
+---------------------------------------------------------------------------+
End of log messages from FND_FILE
+---------------------------------------------------------------------------+

plz help.

thanks

krihna