what is this? am getting Error 1 Cannot find type System.ApplicationException in module mscorlib.dll. agsxmpp_demo

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C#5.0

XMPP

Windows-Phone-8.1

i am trying to connect server here for my wp8.1 chat app iam getting this erroe what is this? this s first time i got this type of error

Error	1	Cannot find type System.ApplicationException in module mscorlib.dll.	agsxmpp_demo

my code ..

using System;
using System.Collections.ObjectModel;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using Matrix.Xmpp;

using Matrix.Xmpp.Client;
using Matrix.Xmpp.Sasl;
using agsXMPP;
using agsXMPP.protocol.client;
using agsXMPP.protocol.iq.roster;
using agsXMPP.protocol.iq.vcard;
using agsXMPP.Collections;
using Windows.UI.Popups;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=391641

namespace agsxmpp_demo
{

    public sealed partial class MainPage : Page
    {

        public string Jid_Sender = "sree1";
        public string pw = "sree2";
        string uname = "aps";
        string server = "taurus";


        public MainPage()
        {
            this.InitializeComponent();

            this.NavigationCacheMode = NavigationCacheMode.Required;
        }


        protected override void OnNavigatedTo(NavigationEventArgs e)
        {

        }


      void loggedIn (object o)
    {

        Frame.Navigate(typeof(page2));
    }



      void loginFailed(object o,agsXMPP.Xml.Dom.Element el)

      {
          MessageDialog msgbox = new MessageDialog("Check server name/IpAddress");

      }


        private void Button_Click(object sender, RoutedEventArgs e)
        {

           
            agsXMPP.XmppClientConnection objXmpp = new agsXMPP.XmppClientConnection();
            Jid jid = new Jid("xyz@taurus.com");
            objXmpp.Server = jid.Server;
            objXmpp.Username = jid.User;
            objXmpp.Password = "sree";
            objXmpp.AutoResolveConnectServer = true;
            try
            {
                objXmpp.OnLogin += loggedIn; // loggedIn is handler for successful login to server.
                objXmpp.OnAuthError += loginFailed;
                objXmpp.Open();
            }

            catch(Exception ex)
            {



            }
   



        }
    }
}