System.ArgumentNullException:(Error in MOSS) in UI for ASP.NET AJAX

System.ArgumentNullException: No message was deserialized prior to calling the DispatchChannelSink. Parameter name: requestMsg at System.Runtime.Remoting.Channels.DispatchChannelSink.ProcessMessage(IServerChannelSinkStack sinkStack, IMessage requestMsg, ITransportHeaders requestHeaders, Stream requestStream, IMessage& responseMsg, ITransportHeaders& responseHeaders, Stream& responseStream) at System.Runtime.Remoting.Channels.SoapServerFormatterSink.ProcessMessage(IServerChannelSinkStack sinkStack, IMessage requestMsg, ITransportHeaders requestHeaders, Stream requestStream, IMessage& responseMsg, ITransportHeaders& responseHeaders, Stream& responseStream) at System.Runtime.Remoting.Channels.Http.HttpServerTransportSink.ServiceRequest(Object state) at System.Runtime.Remoting.Channels.SocketHandler.ProcessRequestNow()

I found it while opening the Sharepoint Products and Technologies Configuration Wizard or
Sharepoint 3.0 Central Administration windows
Please help me sort out it........

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System.ArgumentNullException:(Error in MOSS)

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