Exception in calling a web service from a composite application service

Hi,
I have created a composite application service with external service as a web service. My web service is deployed on localhost as well as I am running my composite application service in localhost. When i try to test the application service, I get the exception
com.sap.caf.mp.base.exception.InvocationException: Invalid parameters
The exception happens in MPConnector.java 'process' method where I am calling the execute operation on the service.
I have tried testing this through Service Browser as well as creating a callable object on the Application service and testing the callable object.
I am using the NWDS 7.0.06 version
and EP installed on my machine is the Sneak Preview 7.0 sp 7
Will appreciate all help in this regard.
Thanks,
Prachi

Hi Navneet,
I have verified the input/output parameters. They are simple types. All are Strings. Nothing really complex there.
I have the Service Exceptions added already.
And definitely the permissions are disabled but still this isn't working.
Any more clues might be helpful.
Thanks,
Prachi

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