Я начинающий WCF и учусь в Essential WCF.

Я столкнулся с проблемой при использовании ServiceContract NameSpace и Name. когда я запускаю код, я улавливаю ниже InvalidOperationException. Но я не мог ясно понять.

A binding instance has already been associated to listen URI 'http://localhost:8080/NamespaceChange01'. If two endpoints want to share the same ListenUri, they must also share the same binding object instance. The two conflicting endpoints were either specified in AddServiceEndpoint() calls, in a config file, or a combination of AddServiceEndpoint() and config.

Кто-нибудь знает, как избежать InvalidOperationException?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;

namespace NamespaceChange01
{

    [ServiceContract(Name = "MyServiceName", Namespace = "http://ServiceNamespace")]
    public interface IBurgerMaster
    {
        [return: MessageParameter(Name = "myOutput")]
        [OperationContract(Name = "OperationName", Action = "OperationAction", ReplyAction = "ReplyActionName")]
        double GetStockPrice(string ticker);
    }

    [ServiceBehavior(Namespace = "http://MyService")]
    public class BurgerMaster : IBurgerMaster
    {

        public double GetStockPrice(string ticker)
        {
            return 100.99;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            ServiceHost host = new ServiceHost(typeof(BurgerMaster));
            host.Open();
            Console.ReadLine();
            host.Close();
        }
    }
}

app.config

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
  <system.serviceModel>
    <services>
      <service name="NamespaceChange01.BurgerMaster" behaviorConfiguration="mexServiceBehavior">
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8080/NamespaceChange01"/>
          </baseAddresses>
        </host>
        <endpoint name="basic" binding="basicHttpBinding" contract="NamespaceChange01.IBurgerMaster"/>
        <endpoint name="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="mexServiceBehavior">
          <serviceMetadata httpGetEnabled="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
</configuration>

Благодарю.