Getting Exception while hosting WCF service

<system.serviceModel>
      <services>
        <service name="HelloService.HelloService" behaviorConfiguration="mexBehavior">
          <endpoint address="HelloService" binding="basicHttpBinding" contract="HelloService.IHelloService">
          </endpoint>
          <endpoint address="HelloService" binding="netTcpBinding" contract="HelloService.IHelloService">
          </endpoint>
          <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange">
          </endpoint>
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8080/"/>
            <add baseAddress="net.tcp://localhost:8090/"/>
          </baseAddresses>
        </host>
        </service>
      </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="mexBehavior">
          <serviceMetadata httpGetEnabled="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    </system.serviceModel>

class Program
    {
        static void Main()
        {
            using(ServiceHost host= new ServiceHost(typeof(HelloService.HelloService)))
            {
                host.Open();
                Console.WriteLine("Host started @ " + DateTime.Now.ToString());
                Console.ReadLine();
            }
        }
    }