Service Bus Gateway is not starting.
First of all I have tried completely uninstalling all Azure/Fabric/Service Bus type SDKs and installations. I have installed both
If you received this error after updating to NET framework v4.6+ then Microsoft have a fix for this now, download this Update for Service Bus Server 1.1 (KB3086798) http://www.microsoft.com/en-us/download/details.aspx?id=49496