Alguem ja teve essa exception?
System.InvalidOperationException: An exception occured when initializing duplex channels. Please ensure your application .xap package contains the assembly System.ServiceModel.Extensions.dll.
em System.ServiceModel.Dispatcher.ClientRuntime.get_DuplexHelper()
em System.ServiceModel.Description.DispatcherBuilder.BuildProxyBehavior(ServiceEndpoint serviceEndpoint, BindingParameterCollection& parameters)
em System.ServiceModel.Channels.ServiceChannelFactory.BuildChannelFactory(ServiceEndpoint serviceEndpoint)
em System.ServiceModel.ChannelFactory.CreateFactory()
em System.ServiceModel.ChannelFactory.OnOpening()
em System.ServiceModel.Channels.CommunicationObject.Open(TimeSpan timeout)
em System.ServiceModel.ChannelFactory.EnsureOpened()
em System.ServiceModel.ChannelFactory`1.CreateChannel(EndpointAddress address, Uri via)
em System.ServiceModel.ChannelFactory`1.CreateChannel()
em IChess.SilverLight.ChessGame.Chess..ctor() [Line: 0 Position: 0]
Abs
Ozzyvegeta
