Getting problem when i run the Web Service Connector

gurus:

I am newbie to Web Services, I am trying to create my first Web service by following the Sample provided by Mark in the forum.

I created simple flow service and tested it works fine.
Created wrapper service and built test flow service to invoke Wrapper service and tested it works fine.

I created WSDL file (protocol SOAP-MSG)for the wrapper service and gave the same target spacename which i gave for container doc types.

Created Web service connector and trying to run it fails.

status: 500
status message:Internal Server Error

If i try to step thru in webservice Connector, it fails pub.soap.utils:CreateSoapData

We are on IS6.1

Can somebody point me like what could be reasons?

Thanks
WMRAM

Can u be MOre specific