WCF Error – Could not find default endpoint element that references contract ‘UserService.UserService’

I had a run in with the same problem. My application was also a Silverlight application and the service was being called from a class library with a custom UserControl that was being used in it.

The solution is simple. Copy the endpoint definitions from the config file (e.g. ServiceReferences.ClientConfig) of the class library to the config file of the silverlight application. I know you’d expect it to work without having to do this, but apparently someone in Redmond had a vacation that day.

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