Interop Problem: Object or class does not support the set of events

Can anyone advise me on this issue?  I'm at a complete loss, and resorting
to 'bottom-up' rewrites to get my C# event source accepted by my VB6 client.
My COM interface is as below:



    public delegate void ProgressChangedEvent(string currentSection, int
totalRecords, int processedRecords);



    [ComVisible(true)]

    [Guid("41AC9609-F777-41ac-901B-E8EAAEDFD486")]

    [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]

    public interface _ExportEngine

    {

        string ConnectionString { get; set; }

        void RunExport(int batchId, string connectionString);

        int DemoDelay { get; set; }

        void DemoExportFile(string filePath);

    }



    [ComVisible(true)]

    [Guid("35182B01-57E1-4e46-978F-5AEAC43C04A9")]

    [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)]

    public interface _ExportEngineEvents

    {

        void ProgressChangedEvent(string currentSection, int totalRecords,
int processedRecords);

    }



    [ComVisible(true)]

    [Guid("A5F75277-D8B7-4749-A3B7-A3AA0869B23F")]

    [ClassInterface(ClassInterfaceType.None)]

    [ComSourceInterfaces(typeof(_ExportEngineEvents))]

    public class ExportEngine: _ExportEngine

    {...






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