XML Parse Exception occur

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C#

WPF

The invocation of the constructor on type 'WpfApplication1.MainWindow' that matches the specified binding constraints threw an exception.' Line number '4' and line position '9'.

That was the error i'm facing while changing my target platform from 'x86' to 'Any CPU' inorder to run my executable to run in x86 and x64 bit windows operating systems.

Application executes flawlessly if its target platform is 'x86', but raising the above exception while executing in platform target 'Any CPU'.

this is code in MainWindow

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
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    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,>)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,>();
                //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);
        }
    }
}