Virtual Apps 7.15 -VDA is unable to Register with DDC

Server VDA machine does not get registered. Following Error is thrown on the VDA Event viewer

Error details:

Failed to start WCF services. Exception ‘Object reference not set to an instance of an object.’ of type ‘System.NullReferenceException’

COM component was unable to Load StackManager.ConnectToStackControlComServerAndVerify: COM exception System.InvalidCastException: Unable to cast COM object of type ‘System.__ComObject’ to interface type ‘Citrix.StackControlService.StackControl’. This operation failed because the QueryInterface call on the COM component for the interface with IID ‘{BEE5F9CD-A777-47C7-BA5A-CDD82FFEC4D8}’ failed due to the following error: Error loading type library/DLL. (Exception from HRESULT: 0x80029C4A (TYPE_E_CANTLOADLIBRARY)). at Citrix.Cds.BrokerAgent.AgentToStack.ConnectToStackControlCOMServer() at Citrix.Cds.BrokerAgent.StackManager.ConnectToStackControlComServer(StackCapabilities& actualStackCapabilities, Int32 retryCount)


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