Error while creating an object

Hi,

I got the following error appearing when i run my code.

NullReferenceException: Object reference not set to an instance of an object Login+$Login$2+$.MoveNext () (at Assets/Scripts/Login.js:68)

I was wondering if any of you had an idea about where it's coming from.

btw here is the code:

 import SimpleJSON;
 
 private var formNick = ""; //this is the field where the player will put the name to login
 private var formPassword = ""; //this is his password
 public static var infouser : User = null;
 var formText = ""; //this field is where the messages sent by PHP script will be in
 
 var urlip   = "http://checkip.dyndns.org/";
 static var pubIP = "";
 var xhr;
 
 
 var URL = "localhost/PTUT/login.php"; 
 var hash = "hashcode"; 
 
 private var textrect = Rect (10, 90,800, 800); //just make a GUI object rectangle
 
 function OnGUI() {
     GUI.Label( Rect (10, 10, 80, 20), "Your nick:" ); //text with your nick
     GUI.Label( Rect (10, 30, 80, 20), "Your pass:" );
 
     formNick = GUI.TextField ( Rect (90, 10, 100, 20), formNick ); //here you will insert the new value to variable formNick
     formPassword = GUI.TextField ( Rect (90, 30, 100, 20), formPassword ); //same as above, but for password
 
     if ( GUI.Button ( Rect (10, 60, 100, 20) , "Connexion" ) ){ //just a button
         Login();
     }
     GUI.TextArea( textrect, formText );
 
     if(GUI.Button(Rect(115, 60, 100, 20), "Quitter")){ 
         Application.LoadLevel("Accueil");
     }
 }
 
 public class User
 {
     public var noJoueur : int;
     public var pseudo : String;
     public var dateInscription : Date;
     public var tempsdeJeu : String;
     public var niveau : int;
 
     public function User(no : int, pse : String, dateI : Date, tempsJ : String, niv : int){
         noJoueur = no;
         pseudo = pse;
         dateInscription = dateI;
         tempsdeJeu = tempsJ;
         niveau = niv;
     }
 
 }
 
 
 function Login() {
     var form = new WWWForm(); //here you create a new form connection
     form.AddField( "myform_hash", hash ); //add your hash code to the field myform_hash, check that this variable name is the same as in PHP file
     form.AddField( "myform_nick", formNick );
     form.AddField( "myform_pass", formPassword );
     var w = new WWW(URL, form); //here we create a var called 'w' and we sync with our URL and the form
     yield w; //we wait for the form to check the PHP file, so our game dont just hang
 
     if (w.error != null) {
         print(w.error); //if there is an error, tell us
     } else {
         var data = JSON.Parse(w.text);
         var N = parseInt(data["Statut"]);
         if(N==1){
             var temp : User = new User(parseInt(data["noJoueur"]),data["pseudo"].Value,data["dateInscription"].AsDate,data["tempsdeJeu"].Value,parseInt(data["niveau"]));
             print("ok");
             CheckIP();
             Debug.Log(pubIP);
             Application.LoadLevel("Main");
         }else{
             formText = data["message"]; //here we r    eturn the data our PHP told us
         }
         w.Dispose(); //clear our form in game
     }
 
 
     /*request(readData);
     Debug.Log(xhr.reponseText);
     infouser = JSON.Parse(xhr.reponseText);*/
 
 
 
     formNick = ""; //just clean our variables
     formPassword = "";
 }
 
 function CheckIP(){
     var www : WWW = new WWW (URL);
     yield www;
    pubIP = www.tex;
    //pubIP = pubIP.Substring(pubIP.IndexOf(“:”)+1);
    //pubIP = pubIP.Substring(0,pubIP.IndexOf(“<"));
     Debug.Log(pubIP);
 }