WCF错误109：这是从管道读取错误 . 管道在客户端关闭

我在我的客户端应用程序上收到以下错误

There was an error reading from the pipe: De pipe is beëindigd. (109,0x6d).

使用我的OperationContract的特定实现时 . 以下是一个切入点的示例 . 我的DataContracts如下：

[DataContract]
public class Person
{
    [DataMember]
    public string FirstName { get; set; }
    [DataMember]
    public string LastName { get; set; }
}

[DataContract]
public class Employee : Person
{
    [DataMember]
    public string Function { get; set; }
}

我的ServiceContract看起来像这样：

[ServiceContract] public interface IAuthentication {

[OperationContract]
[WebGet]
Person GetDeveloper();

[OperationContract]
[WebGet]
Person GetArchitect();

}

我实现了这个服务，如下面的类：

public class Authentication : IAuthentication
{
    public Person GetDeveloper()
        {
            Person architect = new Person()
            {
                FirstName = "Asghar",
                LastName = "Panahy"
            };
            return architect;
        }

        public Person GetArchitect()
        {
            Employee architect = new Employee()
            {
                FirstName = "Asghar",
                LastName = "Panahy",
                Function = "Architect"
            };
            return architect;
        }
}

注意：两个方法都返回相同的类型，只有一个实例发送一个Person并返回它，而第二个方法实现一个Personee也是一个Person .

当我从客户端调用它时，我在服务器上没有收到任何错误，但在客户端：

Console.WriteLine(" Connecting to Authenticate service... ");

            NetNamedPipeBinding myBinding = new NetNamedPipeBinding("Authentication.Endpoint"); ;
            EndpointAddress myEndpoint = new EndpointAddress("net.pipe://localhost/authentication"); ;
            var myChannelFactory = new ChannelFactory<IAuthentication>(myBinding, myEndpoint);

            IAuthentication proxy = myChannelFactory.CreateChannel();
            Person person = proxy.GetDeveloper();
            Console.WriteLine(String.Format("GetDeveloper OK : {0} {1} ", person.FirstName, person.LastName));

            person = proxy.GetArchitect();
            Console.WriteLine(String.Format("GetArchitect OK : {0} {1} ", person.FirstName, person.LastName));

输出是：

连接到验证服务... GetDeveloper OK：Asghar Panahy从管道读取错误：De pipeisëindigd . （109,0x6d） .

有人可以帮我这个吗？阿斯加尔