Citrix Server VDI : Failed to start wcf services. Exception object reference not set to an instance of an object

The following System.InvalidCastException is thrown as BrokerAgent starts up, creates our StartWorkerAgentThread, Initializes LaunchManager, and attempts to ConnectToStackControlCOMServer:

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)).

This is caused either by a missing StackController type library or by incorrect registry entries relating to the same.

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