gSOAP invocation question

Hi,
We have created a custom service by merging two OOTB services GeneratePDF service and ApplyPolicy services.

Invoking this custom service via gSOAP web service fails with the following error.

SOAP 1.1 fault: SOAP-ENV:Server.userException [no subcode]
"ALC-DSC-003-000: com.adobe.idp.dsc.DSCInvocationException: Invocation error."
ALC-PDG-011-020-The source file you submitted is not supported by this version of PDF Generator.

Anyone has any examples of using gSOAP to invoke GeneratePDF service?

Can post a code snippet if required.

Thanks
Praveen Ramamurthy