Silverlight Non-Descript Errors When Deploying Using WCF Services

You deliver a Silverlight module that uses WCF Services to a production server.  It works great on your machine, but when you run it in production, you get an error every time you call out to a WCF service.  

 

The issue may be in the ServiceReference.Config file.  In the <System.serviceModel> section, in the <client> section, you will see endpoints for every service.  Change the 'address' of these to the endpoints that you use in production, recompile, and deliver the module.