unresolved external symbol CLSID_CBMDSwitcherDiscovery

I'm trying to develop an app to control my ATEM but am having difficulty getting started with the SDK

I get the following linking error:

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error LNK2001: unresolved external symbol CLSID_CBMDSwitcherDiscovery

I think I have included all the required libraries etc as below

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#include "include\BMDSwitcherAPI.h"

#include <cstdio>
#include <map>
#include <string>
#include <utility>
#include <vector>

#include <conio.h>
#include <comutil.h>
#include <atlbase.h>

And my attempt to setup switcher discovery is direct from the sample code:

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CComPtr<IBMDSwitcherDiscovery>   switcherDiscovery;
HRESULT   result;

result = switcherDiscovery.CoCreateInstance(CLSID_CBMDSwitcherDiscovery, NULL, CLSCTX_ALL);
if (result != S_OK)
{
fprintf(stderr, "A Switcher Discovery instance could not be created.  The Switcher drivers may not be installed.\n");
}

Anyone got any suggestions or ideas to help here?

All Sorted
I hadn't like the library correctly.