Flash Game Creating Score-Dynamic Text Field (AS3) -

creating pacman-like game, player eats objects. when movieclip (box) eats circle on stage, score in dynamic text field should go 10 points.

receiving error: line: `scorefield.text = " " + string(currentscore);

error message: call possibly undefined method string.

 package {    import flash.display.sprite;    import flash.display.movieclip;    import flash.events.event;    import flash.events.keyboardevent;    import flash.ui.keyboard;     public class move extends movieclip {     //var scoreobjects:array = new array(); // creates scoreobjects array       var circle:movieclip;         private var keyright:boolean=false;       private var keyleft:boolean=false;       private var keyforward:boolean=false;       private var keybackward:boolean=false;       private var forwardmove:int=0;       private var sidemove:int=0;        private var inertia:int=8; //amount of friction     //var score_field:string;    //var point:movieclip;    //private var playerscore:int;     var currentscore:int;    // constructor--------------------------------------------------------------------       public function move() {          init();       }   // function init -----------------------------------------------------------------    function init():void {           //stage.framerate=60;     //var score_field:string="";    /*scoreobjects[0] = new circle();   scoreobjects[0].amount = 1; // amount of point -- not sure   scoreobjects[0].name = "circle";*/   circle.amount = 10; // each circle worth 10 points    //var playerscore:int = 0;   var currentscore:int = 0;           stage.addeventlistener(event.enter_frame, frameloop);          stage.addeventlistener(keyboardevent.key_down,keydownevent);          stage.addeventlistener(keyboardevent.key_up, keyupevent);      box.addeventlistener(event.enter_frame, eatcircle);     wall.addeventlistener(event.enter_frame, hitwall);        //stage.addchild(scoreobjects[0]); // add score objects stage ------------------------------     //trace(scoreobjects[0]);      /*scoreobjects[0].x = 105;     scoreobjects[0].y = 233;*/        }   // function eatcircle --------------------------------------------------------------  function eatcircle(event:event):void {    if (box.hittestobject(circle)) {     trace ("i ate circle");     stage.removechild(circle);     var newpoint:int;     newpoint = circle.amount;     // point = scoreobjects[0].amount //store property's value of amount in variable...?     calcpoints(newpoint);     //box.deleteeventlistener(event.enter_frame, eatcircle)     //calcscore();     //playerscore++;    } else {     trace ("i didn't eat circle");    }  }   function calcpoints(newpoint:int):void {   currentscore += newpoint;   updatedisplayscore(currentscore);   }   function updatedisplayscore(currentscore:int) {    scorefield.text = " " + string(currentscore);    var displaytext:string="";      displaytext = scorefield.text; // assigning message field*/  }     // function hitwall --------------------------------------------------------------  function hitwall(event:event):void {   if (box.hittestobject(wall)) {     box.y+=6;    } else if (box.hittestobject(wall2)) {     box.y-=6;     } else if (box.hittestobject(wall3)) {      box.x+=6;     } else if (box.hittestobject(wall4)) {     box.x-=6;       }   }   // function keydownevent ------------------------------------------------------------      function keydownevent(event:keyboardevent):void {          switch (event.keycode) {             case keyboard.up:                keyforward = true;                keybackward = false;                break;              case keyboard.down:                keybackward = true;                keyforward = false;                break;              case keyboard.left:                keyleft = true;                keyright = false;                break;              case keyboard.right:                keyright = true;                keyleft = false;                break;          }       }   // function keyupevent ------------------------------------------------------------      function keyupevent(event:keyboardevent):void {          switch (event.keycode) {              case keyboard.up:                keyforward = false;                break;              case keyboard.down:                keybackward = false;                break;              case keyboard.left:                keyleft = false;                break;              case keyboard.right:                keyright = false;                break;          }       }   // function frameloop ------------------------------------------------------------      function frameloop(event:event):void {           //amount of force          if (keyforward) {             forwardmove -=2;          }          if (keybackward) {             forwardmove += 2;          }          if (keyleft) {             sidemove -= 2;          }          if (keyright) {             sidemove += 2;          }           forwardmove +=(0-forwardmove)/inertia;          sidemove +=(0-sidemove)/inertia;           box.y+=forwardmove;          box.x+=sidemove;     //point = e.currenttarget.amount;         }      }// end of class }// end of package 

scorefield.text = " " + string(currentscore); 

should be

scorefield.text = " " + string(currentscore);