SOAP, JSON и POX в одном и том же состоянии. wcf

Я пытаюсь использовать SOAP и RESTful в одной службе WCF. Я тоже этого добился, за исключением одной проблемы. Ниже приведен мой файл web.config:

<service behaviorConfiguration="webBehaviour" name="MyServices">
        <clear />
        <endpoint address="" binding="basicHttpBinding" bindingConfiguration="basicHttp"
         name="basicHttpBinding" contract="DJSharedServices.IMyServices" />
        <endpoint address="ws" binding="wsHttpBinding" bindingConfiguration="WsHttp"
          name="wsHttpBinding" contract="DJSharedServices.IMyServices" />
        <endpoint address="web" binding="webHttpBinding" bindingConfiguration="WebHttp" behaviorConfiguration="webBehavior"
          name="webHttpBinding" contract="DJSharedServices.IMyServices" />
        <endpoint address="json" binding="webHttpBinding" bindingConfiguration="WebHttp" behaviorConfiguration="webJSONBehavior"
          name="webJSONHttpBinding" contract="DJSharedServices.ISharedServices" />
        <endpoint address="mex" binding="mexHttpBinding"    contract="IMetadataExchange"   name="mexBinding" />        
       </service>    
    </services>

Когда у меня есть все конечные точки, он дает следующую ошибку:

An ExceptionDetail, likely created by IncludeExceptionDetailInFaults=true, whose value is:
System.NullReferenceException: Object reference not set to an instance of an object.
   at System.ServiceModel.Description.WsdlExporter.CreateWsdlBindingAndPort(ServiceEndpoint endpoint, XmlQualifiedName wsdlServiceQName, Port& wsdlPort, Boolean& newBinding, Boolean& bindingNameWasUniquified)
   at System.ServiceModel.Description.WsdlExporter.ExportEndpoint(ServiceEndpoint endpoint, XmlQualifiedName wsdlServiceQName)
   at System.ServiceModel.Description.WsdlExporter.ExportEndpoints(IEnumerable`1 endpoints, XmlQualifiedName wsdlServiceQName)
   at System.ServiceModel.Description.ServiceMetadataBehavior.MetadataExtensionInitializer.GenerateMetadata()
   at System.ServiceModel.Description.ServiceMetadataExtension.EnsureInitialized()
   at System.ServiceModel.Description.ServiceMetadataExtension.HttpGetImpl.InitializationData.InitializeFrom(ServiceMetadataExtension extension)
   at System.ServiceModel.Description.ServiceMetadataExtension.HttpGetImpl.GetInitData()
   at System.ServiceModel.Description.ServiceMetadataExtension.HttpGetImpl.TryHandleDocumentationRequest(Message httpGetRequest, String[] queries, Message& replyMessage)
   at System.ServiceModel.Description.ServiceMetadataExtension.HttpGetImpl.ProcessHttpRequest(Message httpGetRequest)
   at System.ServiceModel.Description.ServiceMetadataExtension.HttpGetImpl.Get(Message message)
   at SyncInvokeGet(Object , Object[] , Object[] )
   at System.ServiceModel.Dispatcher.SyncMethodInvoker.Invoke(Object instance, Object[] inputs, Object[]& outputs)
   at System.ServiceModel.Dispatcher.DispatchOperationRuntime.InvokeBegin(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage5(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage41(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage4(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage31(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage3(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage2(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage11(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.ImmutableDispatchRuntime.ProcessMessage1(MessageRpc& rpc)
   at System.ServiceModel.Dispatcher.MessageRpc.Process(Boolean isOperationContextSet)

Все работает нормально, если я закомментирую конечную точку json.

Не могли бы вы помочь мне узнать почему ??

Заранее спасибо.