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I get an InvalidOperationException When Invoking a Service
namespace HelloIndigo
{
  public class Service : IHelloIndigoService
  {
      public string HelloIndigo()
      {
        return "Hello Indigo";
      }
  }

  [ServiceContract(Namespace = "http://www.thatindigogirl.com/samples/2006/06")]
  interface IHelloIndigoService
  {
    [OperationContract]
    string HelloIndigo();
  }
}

namespace Host
{
  class Program
  {
    static void Main(string[] args)
    {
      using (ServiceHost host = new ServiceHost(typeof(HelloIndigo.Service),
                                    new Uri("http://localhost:8000/HelloIndigo")))
      {
        host.AddServiceEndpoint(typeof(HelloIndigo.Service),
                                    new BasicHttpBinding(),"Service");
        host.Open();
        Console.WriteLine("Press enter to terminate the host service");
        Console.ReadLine();
      }
    }
  }
}

host.AddServiceEndpoint(typeof(HelloIndigo.IHelloIndigoService),
                                new BasicHttpBinding(),"Service");