我在做《WCF技术剖析》里面的第一个应用程序时，出现

应用程序“DEFAULT WEB SITE”中的服务器错误

这些错误，IIS我按照http://apps.hi.baidu.com/share/detail/1816653这里面的配置好了呀，

承载服务的代码是：

namespace Host
{
    class ContractHost
    {
        static void Main(string[] args)
        {
            using (ServiceHost host = new ServiceHost(typeof(ContractsService)))
            {
                host.AddServiceEndpoint(typeof(ICalculator), new WSHttpBinding(), "http://localhost:8081/ContractsService");
                if (host.Description.Behaviors.Find<ServiceMetadataBehavior>() == null)
                {
                    ServiceMetadataBehavior behavior = new ServiceMetadataBehavior();
                    behavior.HttpGetEnabled = true;
                    behavior.HttpGetUrl = new Uri("http://localhost:8081/ContractsService/metadata");
                    host.Description.Behaviors.Add(behavior);
                }

                host.Opened += delegate
                {
                    Console.WriteLine("ContractsService己启动，按任意键结束");
                };

                host.Open();
                Console.Read();
            }
        }
    }
}

错在哪里？

对了，http://localhost:8081/ContractsService中的ContractsService是自定义的吧。