Error in UWL Config

Dear Gurus!

I have configured UWL system in portal but when i am trying to see the request in Task list inside portal, it's showing nothing!

Its thowing me follwoing exception -

Exception type:com.sap.netweaver.bc.uwl.connect.ConnectorException Message:Thu Nov 22 17:28:29 IST 2007

: No User mapping set up for user USER.R3_DATASOURCE.P12345678 system :SAP_UWL

Please help me to sort out the things.

Points are there for useful reply.

Regards,

Roshan