COM Callable Library Problem

I've just created a COM Callable C# class library, registered with the
Register for COM Interop option, just for testing.  Then I'm using some VBA
code to instantiate the object and call it's only method.  When I run the
code below, I get an "Object reference not set to an instance of an object."
error, but my object isn't Nothing.



I suspect the interop to be the problem.  Has anyone encountered anything
like this before?



    Set pdGen = New PdfGenerator.PdfGenerator  <My C# class>

    ret = pdGen.GeneratePdf(xmlPath, conn)


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