故障异常窗口电话连接到WCF WP8

Question

我创建了一个WCF，然后我创建了一个WP8应用程序并添加了服务引用。错误是＆＃34;类型＆System; Service.ServiceModel.FaultException＆＃39;发生在System.ServiceModel.ni.dll中，但未在用户代码＆＃34;

中处理

如果有人能够给我一些指示，因为我用谷歌搜索了这个并发现没有相同的东西。

错误出现在这里

public void EndAddUser(System.IAsyncResult result) 
{
    object[] _args = new object[0];
    base.EndInvoke("AddUser", _args, result);
}

我的主要课程：

public partial class MainPage : PhoneApplicationPage
{
    private Service1Client _serviceClient;
    // Constructor
    public MainPage()
    {
        InitializeComponent();
        _serviceClient = new Service1Client();
        _serviceClient.LoginUserCompleted += new     

    }

    private void loginBtn_Click(object sender, RoutedEventArgs e)
    {
        _serviceClient.LoginUserAsync(userNameTxtBox.Text, passwordTxtBox.Text);

    }

    private void newAccountBtn_Click(object sender, RoutedEventArgs e)
    {
        this.NavigationService.Navigate(new Uri("/AddAccount.xaml", UriKind.Relative));
    }

    private void _serviceClient_LoginUserCompleted(object senter,         
    LoginUserCompletedEventArgs e)
    {
        if (e.Error == null && e.Result != null)
        {

            MessageBox.Show("Welcome " + e.Result + "!");
        }
        else
        {
            MessageBox.Show("Could not log in. Please check user name/password and try
          again.");                  
        }
    }
}



public partial class AddAccount : PhoneApplicationPage
{
    private Service1Client _serviceClient;

    public AddAccount()
    {
        InitializeComponent();
        _serviceClient = new Service1Client();
        _serviceClient.AddUserCompleted += new EventHandler<AsyncCompletedEventArgs>
        (_serviceClient_AddUserCompleted);
    }

    private void addAccountBtn_Click(object sender, RoutedEventArgs e)
    {
        _serviceClient.AddUserAsync(fullnameTxtBox.Text, userNameTxtBox.Text,   
       passwordTxtBox.Text);
    }

    void _serviceClient_AddUserCompleted(object sender, AsyncCompletedEventArgs e)
    {
        if (e.Error == null)
        {
            MessageBox.Show("User account created. Please login");
            this.NavigationService.GoBack();
        }
        else
        {
            MessageBox.Show("User account could not be added, Please try again");
        }
    }
}