Error while using IDOCXmlToFlatConvertor module

All,

Scenario: IDoc to File >> Convert IDoc XML to Flat File.

System: PI 7.11 patch5

Per blog by William Ly, this can be done using standard Out of the box Adapter Module 'IDOCXmlToFlatConvertor'. Link to the blog:

http://scn.sap.com/community/pi-and-soa-middleware/blog/2009/04/01/how-to-use-user-module-for-conversion-of-idoc-messages-between-flat-and-xml-formats

We have configured the RFC destination to backend ECC system and also created the JCA Connection Factory in NWA.

When we test the scenario by running the sample payload through RWB to the FIle receiver adapter with the above mentioned module, I am getting the following error:

Delivering the message to the application using connection File_http://sap.com/xi/XI/System failed, due to: com.sap.engine.interfaces.messaging.api.exception.MessagingException: com.sap.conn.idoc.IDocException: (0) IDOC_ERROR_INITIALIZATION: Exception in record factory. Check the configuration of ResourceAdapter.

Pls advice.