Webservices error

I have created a webservice in my sap netweaver 7.2 system.

We are working on CRM2007.

Now when I try to create a proxy to consume this service, I get an exception when executing the ABAP program.

The exception is caught by the class CX_AI_SYSTEM_FAULT.

Can anyone please throw some light?

Thanks and Regards,

Ravi Bhatnagar