c# - XMLParseException が発生する

Question

指定されたバインディング制約に一致するタイプ 'WpfApplication1.MainWindow' でのコンストラクターの呼び出しで例外がスローされました。行番号「4」および行位置「9」。

これは、実行可能ファイルを x86 および x64 ビット Windows オペレーティング システムで実行するために、ターゲット プラットフォームを「x86」から「任意の CPU」に変更するときに直面したエラーです。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using WebKit;
using WebKit.Interop;
using Twitterizer;
using Facebook;
using TwitterConnect;
using facebook;

namespace WpfApplication3
{   
public partial class MainWindow : Window
{
    public MainWindow()
    {
            InitializeComponent();

        }

    WebKitBrowser wb = new WebKitBrowser();
    TwitterConnect.TwitterStuff ts = new TwitterStuff();
    Browser b = new Browser();
    OpenWebkitBrowser.facebook fb_1 = new OpenWebkitBrowser.facebook();

    private void Possibillion_Loaded(object sender, RoutedEventArgs e)
    {
        System.Windows.Forms.Integration.WindowsFormsHost host = new System.Windows.Forms.Integration.WindowsFormsHost();
        host.Child = wb;
        this.Grid2.Children.Add(host);
        wb.DocumentCompleted += wb_DocumentCompleted;
    }

    void wb_DocumentCompleted(object sender, System.Windows.Forms.WebBrowserDocumentCompletedEventArgs e)
    {
        textBox1.Text = wb.Url.ToString();
        TabItem1.Header = wb.DocumentTitle;
    }

    private void btnMinimize_Click(object sender, RoutedEventArgs e)
    {
        Possibillion.WindowState = WindowState.Minimized;
    }

    private void btnMaximize_Click(object sender, RoutedEventArgs e)
    {
        if (Possibillion.WindowState == WindowState.Maximized)
            Possibillion.WindowState = WindowState.Normal;
        else
            Possibillion.WindowState = WindowState.Maximized;
    }

    private void btnClose_Click(object sender, RoutedEventArgs e)
    {
        Possibillion.Close();
    }

    private void btnGo_Click(object sender, RoutedEventArgs e)
    {
        wb.Navigate("http://" + textBox1.Text);
    }

    private void btnTwitter_Click(object sender, RoutedEventArgs e)
    {
        bool loggedIn = b.AlreadyLoggedIn();

        if (!loggedIn)
        {
            //this.Hide();
            b.Show();
        }
        //else
        //{
        //    MainWindow mw = new MainWindow();
        //    mw.Show();
        //    this.Close();
        //}



        else if (textBox1.Text != "")
        {
            ts.tweetIt(wb.DocumentTitle);
            //textBox1.Clear();
        }
    }

    private void btnfacebook_Click_1(object sender, RoutedEventArgs e)
    {
        if (val.login == true)
        {
            //fb_1.Show();
            if (string.IsNullOrEmpty(textBox1.Text))
            {
                Dispatcher.Invoke(new Action(() => { System.Windows.MessageBox.Show("Enter message."); }));
                return;
            }

            var fb = new FacebookClient(val.token);

            fb.PostCompleted += (o, args) =>
            {
                if (args.Error != null)
                {
                    Dispatcher.Invoke(new Action(() => { System.Windows.MessageBox.Show(args.Error.Message); }));
                    return;
                }

                var result = (IDictionary<string, object>)args.GetResultData();
                //_lastMessageId = (string)result["id"];

                Dispatcher.Invoke(new Action(() =>
                {
                    System.Windows.MessageBox.Show("Message Posted successfully");

                    textBox1.Text = string.Empty;
                    // pho.IsEnabled = true;
                }));
            };
            var fbimg = new Facebook.FacebookMediaObject
            {
                FileName = Guid.NewGuid() + ".jpg",
                ContentType = "image/png"
            };

            //  FileStream fs = new FileStream("Rose.png", FileMode.Open, FileAccess.Read);
            //  BinaryReader br = new BinaryReader(fs);
            //  byte[] res = br.ReadBytes((int)fs.Length);
            //  br.Close();
            //  fs.Close();
            //fbimg.SetValue(res);
            //   Uri uri = new Uri("/Background.png",UriKind.Relative);
            var parameters = new Dictionary<string, object>();
            //parameters.Add("picture", fbimg);
            //parameters.Add("message", "hi");
            // parameters["picture"] ="https://twimg0-a.akamaihd.net/profile_images/2263781693/SAchin_reasonably_small.png";
            parameters["message"] = textBox1.Text;
            //  parameters["picture"] =fbimg;
            //fb.PostAsync(@"/photos", parameters);
            fb.PostAsync("me/feed", parameters);
        }
        else
        {
            Dispatcher.Invoke(new Action(() => { fb_1.ShowDialog(); }));
            //System.Windows.MessageBox.Show("message not sent");

        }
    }

    private void textBox1_PreviewKeyDown(object sender, KeyEventArgs e)
    {
        if (e.Key == Key.Enter)
            wb.Navigate("http://" + textBox1.Text);
    }
}
}