{{Quickfixn}} onMessage issues

[xmoon 2000]

I am able to connect, logon and am receive messages from the server.

However I am now trying to Crack these messages but cannot declare on
onMessage:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using QuickFix;
using QuickFix.Fields;

But it cannot find a "suitable" override for onMessage - how should I
declare it?

   public class MyQuickFixApp : QuickFix.MessageCracker,QuickFix.Application
    {
       public override void
onMessage(QuickFix.FIX42.MarketDataIncrementalRefresh message, SessionID
sessionID)
        {

            var tags = message.GetGroupTags();

            foreach (var tag in tags)
            {
               Console.WriteLine("onMessage Tags: " +tag);
            }

        }
}
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