在邮件信封中找不到body元素

Question

我在asp.net应用程序中调用Web服务。

MyService s = new MyService();
s.myMethod();

s.myMethod()返回：

System.ServiceModel.CommunicationException: A body element was not found inside the message envelope.

Server stack trace: 
   at System.ServiceModel.Channels.ReceivedMessage.VerifyStartBody(XmlDictionaryReader reader, EnvelopeVersion version)
   at System.ServiceModel.Channels.BufferedMessage..ctor(IBufferedMessageData messageData, RecycledMessageState recycledMessageState, Boolean[] understoodHeaders, Boolean understoodHeadersModified)
   at System.ServiceModel.Channels.TextMessageEncoderFactory.TextMessageEncoder.ReadMessage(ArraySegment`1 buffer, BufferManager bufferManager, String contentType)
   at System.ServiceModel.Channels.HttpInput.DecodeBufferedMessage(ArraySegment`1 buffer, Stream inputStream)
   at System.ServiceModel.Channels.HttpInput.ReadBufferedMessage(Stream inputStream)
   at System.ServiceModel.Channels.HttpInput.ParseIncomingMessage(Exception& requestException)
   at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelRequest.WaitForReply(TimeSpan timeout)
   at System.ServiceModel.Channels.RequestChannel.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Dispatcher.RequestChannelBinder.Request(Message message, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

现在我确定MyService已启动并正在运行。 此外，这种错误不会经常发生。

MyService在另一台机器上运行。 当我查看MyService的日志文件时，我可以看到我的请求正在处理中。

之前是否有人遇到此错误消息？