c# - XMLParseException occurs -

the invocation of constructor on type 'wpfapplication1.mainwindow' matches specified binding constraints threw exception.' line number '4' , line position '9'.

that error i'm facing while changing target platform 'x86' 'any cpu' in order run executable run in x86 , x64 bit windows operating systems.

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);     } } } 

make sure target platform matches build settings.

if have changed configuration manager cpu, in project properties under build need same.

edit - ah seems trying run toolkit build x86 in x64 world.