Re: CoCreateInstance returns COR_E_MEMBERACCESS error

The return value from CoCreateInstance is COR_E_MEMBERACCESS. I've
looked around the 'net and on MSDN and can't find any info on this.

How would I approach figuring out what is causing that return value?
In other words, does that error code give me some kind of clue about
what to change?

---- Background: -----

The COM DLL is a .NET C-sharp program that begins:

namespace MyNamespace
{
   [Guid("822F83B3-644F-4c59-AA2A-7257D0ABE301")]
   public interface IManagedInterface
   {
       bool Configure(string iniPath);
       bool Connect();
       bool Disconnect();
       string GetUpdate();
   }

   [Guid("0D75D411-AD2F-419c-94EE-91A251ABC41D")]
   public class MyClass : IManagedInterface

etc....

The calling code is:

   IManagedInterface* pInterface = NULL;

  HRESULT hr = CoCreateInstance(CLSID_MyClass,
              NULL, CLSCTX_INPROC_SERVER,
              IID_IManagedInterface,
reinterpret_cast<void**>(&pInterface ));