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If you are trying to raise an event from an ExternalDataExchange service the most likely cause of the problem is adding the service object to the WorkflowRuntime instead of the ExternalDataExchangeService. Calling the ExternalDataExchange service from the workflow will work just fine but raising an event will not work. If you are using C# and not testing for null you will get an NullReferenceException "Object reference not set to an instance of an object.".