wcf services system.servicemodel.communicationexception

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C#

WCF

C#4.0

I am facing this error when I am invoking services in my windows phone application.
Please suggest some solution for the same.

sample code :

private void Button_Click_1(object sender, RoutedEventArgs e)
{
      ServiceReference1.ServiceClient myService = new ServiceReference1.ServiceClient();

      if (txtUser.Text.ToString() != null)
      {
            myService.ValidateAsync(txtUser.Text.ToString(), pwdPassword.ToString());
            System.Threading.Thread.Sleep(TimeSpan.FromSeconds(20));
            myService.ValidateCompleted += new EventHandler<ServiceReference1.ValidateCompletedEventArgs>(myService_ValidateCompleted);
       }
       else
       {
            MessageBox.Show("Enter some username or password");
       }
}

** control is not going to next function showing :
Exception - system.servicemodel.communicationexception in System.ServiceModel.ni.dll

private void myService_ValidateCompleted(object sender, ServiceReference1.ValidateCompletedEventArgs e)
{
       //int a = 0;
       //a = Convert.ToInt32(e.Result);

       if (e.Result== 1)
       {
            MessageBox.Show("Enter");
            // this.NavigationService.Navigate(new Uri("/TilesPage.xaml", UriKind.Relative));
       }
       else if (e.Result == 0)
       {
            MessageBox.Show("Invalid Username or Password");
       }
       else if (e.Result == -1)
       {
            MessageBox.Show("UserName doesn't exists");
       }
       else
       {
            MessageBox.Show("some exception");
       }
}