Can you provide more details about the exception that your client code experiences?
A lot of things can cause an exception.
You can include exception details in the response sent to the client by applying the following attribute to the data service class:
[ServiceBehavior(IncludeExceptionDetailInFaults = true)]
You also can check if you are in cross-domain scenario
and missed to set up the policies properly.
All the best,
the Telerik team
Telerik OpenAccess ORM Meets ASP.NET Web API. Read more.