WCF callback 运行出错,如何解决?

Server Error in '/' Application.

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Contract requires Duplex, but Binding 'BasicHttpBinding' doesn't support it or isn't configured properly to support it.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: Contract requires Duplex, but Binding 'BasicHttpBinding' doesn't support it or isn't configured properly to support it.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[InvalidOperationException: Contract requires Duplex, but Binding 'BasicHttpBinding' doesn't support it or isn't configured properly to support it.]
   System.ServiceModel.Description.DispatcherBuilder.BuildChannelListener(StuffPerListenUriInfo stuff, ServiceHostBase serviceHost, Uri listenUri, ListenUriMode listenUriMode, Boolean supportContextSession, IChannelListener& result) +12285363
   System.ServiceModel.Description.DispatcherBuilder.InitializeServiceHost(ServiceDescription description, ServiceHostBase serviceHost) +1319
   System.ServiceModel.ServiceHostBase.InitializeRuntime() +60
   System.ServiceModel.ServiceHostBase.OnBeginOpen() +27
   System.ServiceModel.ServiceHostBase.OnOpen(TimeSpan timeout) +50
   System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout) +318
   System.ServiceModel.Channels.CommunicationObject.Open() +36
   System.ServiceModel.HostingManager.ActivateService(String normalizedVirtualPath) +184
   System.ServiceModel.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) +615

[ServiceActivationException: The service '/Service1.svc' cannot be activated due to an exception during compilation.  The exception message is: Contract requires Duplex, but Binding 'BasicHttpBinding' doesn't support it or isn't configured properly to support it..]
   System.Runtime.AsyncResult.End(IAsyncResult result) +687598
   System.ServiceModel.Activation.HostedHttpRequestAsyncResult.End(IAsyncResult result) +190
   System.ServiceModel.Activation.HostedHttpRequestAsyncResult.ExecuteSynchronous(HttpApplication context, String routeServiceVirtualPath, Boolean flowContext, Boolean ensureWFService) +234
   System.ServiceModel.Activation.HttpModule.ProcessRequest(Object sender, EventArgs e) +355
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +148
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75