WCF - Unhandled Exception: System.ServiceModel.AddressAccessDeniedException: HTTP could not register URL

using System;
using System.Collections.Generic;
using System.Text;
using System.ServiceModel;
 
namespace HelloIndigo
{
    
    [ServiceContract(Namespace="http://www.thatindigogirl.com/samples/2006/06")]
    public interface IHelloIndigoService
    {   
        [OperationContract]
        string HelloIndigo();
    }
 
    public class HelloIndigoService : IHelloIndigoService
    {
        public string HelloIndigo()
        {
            return "Hello Indigo";
        }
    }
 
}
 
 
using System;
using System.Collections.Generic;
using System.Text;
using System.ServiceModel;
 
namespace Host
{
    class Program
    {
        static void Main(string[] args)
        {
            using (ServiceHost host = new ServiceHost(typeof(HelloIndigo.HelloIndigoService), new Uri("http://localhost:8000/HelloIndigo")))
            {
                host.AddServiceEndpoint(typeof(HelloIndigo.IHelloIndigoService), new BasicHttpBinding(), "HelloIndigoService");
               
                host.Open();
                Console.WriteLine("Press <ENTER> to terminate the service host");
                Console.ReadLine();
            }
        }
    }
}
 
using System;
using System.Collections.Generic;
using System.Text;
using System.ServiceModel;
 
namespace Client
{
    class ServiceProxy
    {
    }
 
    [ServiceContract(Namespace = "http://www.thatindigogirl.com/samples/2006/06")]
    public interface IHelloIndigoService
    {
        [OperationContract]
        string HelloIndigo();
    }
}