MT error

gistfile1.js

Json: {
 "requestId":"ac2aa039-ede3-4f29-b0ee-9fff017e5d37",
 "destinationAddress":"msmq://djlancerock/my_commandhost?tx=false",
 "headers":null,
 "message":{
		"failedMessage":
        {
			"issuedBy":"msmq://localhost/my_commandhost",
			"implementingType":"my.Commands.DiagnosticCommand, MyCommand , Version=1.0.0.0, Culture=neutral, PublicKeyToken=null","identifier":"00000000-0000-0000-0000-000000000000"
		},
		"messages":"Object of type 'my.Commands.DynamicImpl.ImyCommand' cannot be converted totype 'my.Commands.DiagnosticCommand'.",
		"occurredAt":"2012-02-23T04:12:42.2157568Z",
		"stackTrace":"   
					at System.RuntimeType.TryChangeType(Object value, Binderbinder, CultureInfo culture, Boolean needsSpecialCast)
					at System.RuntimeType.CheckValue(Object value, Binder binder, CultureInfo culture, BindingFlags invokeAttr)
					at System.Reflection.MethodBase.CheckArguments(Object[] parameters, Binder binder, BindingFlags invokeAttr, CultureInfo culture, Signature sig)
					at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
					at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
					at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
					at my.Communications.MassTransit.MassTransitBootstrapper.<>c__DisplayClassa.<InitializeHost>b__9(ImyCommand msg) in D:\\Projects\\my Technologies\\trunk\\src\\my.MassTransit\\MassTransitBootstrapper.cs:line 143
					at MassTransit.Pipeline.HandlerSelector.<>c__DisplayClass2`1.<ForHandler>b__1(IConsumeContext`1 x) in d:\\BuildAgent-03\\work\\8d1373c869590c5b\\src\\MassTransit\\Pipeline\\HandlerSelector.cs:line 39
					at MassTransit.Pipeline.Sinks.InboundConvertMessageSink`1.<>c__DisplayClass2.<>c__DisplayClass4.<Enumerate>b__1(IConsumeContext x) in d:\\BuildAgent-03\\work\\8d1373c869590c5b\\src\\MassTransit\\Pipeline\\Sinks\\InboundConvertMessageSink.cs:line 40"
},
"messageType":
"urn:message:MassTransit:Fault[[my.Commands:ImyCommand]]",
"retryCount":"0",
"sourceAddress":"msmq://djlancerock/my_commandhost?tx=false"}