actionscript 3 - I am Getting ArgumentError: Error #2025: -


here code . please can me. beginner .
giving me argumenterror: error #2025: supplied displayobject must child of caller. @ flash.display::displayobjectcontainer/removechild() @ final2_fla::maintimeline/loop() error

import flash.events.event;  import flash.events.mouseevent;  var kup:boolean = false; var kdn:boolean = false; var klt:boolean = false; var krt:boolean = false; var speedx:number = 0; var speedy:number = 0; var level:array=new array(); var scr:number = 0; var cn_arr:array = new array(); var score:number = 0; var rep:replay=new replay(); var player:player=new player(); addchild(player); player.x=200; player.y=250; //scoreboard.txt.text = score.tostring(); var camera = new rectangle(0,0,stage.stagewidth,stage.stageheight); var scoreboard:scoreboard = new scoreboard(); addchild(scoreboard); (var i:int = 0; i< numchildren; i++) {     if (getchildat(i) platform)     {         level.push(getchildat(i).getrect(this));         //trace("ok");     } } (i = 0; i<numchildren; i++) {     if (getchildat(i) cn )     {         cn_arr.push(getchildat(i));     } }   function initgame(e:event):void {  stage.addeventlistener(keyboardevent.key_down, keypressed); stage.addeventlistener(keyboardevent.key_up, keyreleased); stage.addeventlistener(event.enter_frame, loop); }  function keypressed(e:keyboardevent):void {     //trace("pressed");     if (e.keycode == keyboard.a)     {         krt = true;         //trace("krt");     }     if (e.keycode == keyboard.space)     {         kup = true;         //trace("jump");      }     if (e.keycode == keyboard.d)     {         klt = true;         //trace("krt");     }     if (e.keycode == keyboard.s)     {         kdn = true;         //trace("krt");     } }  function keyreleased(e:keyboardevent):void {     //trace("notpressed");     if (e.keycode == keyboard.a)     {         krt = false;         //trace("unkrt");     }     if (e.keycode == keyboard.space)     {         kup = false;         //trace("unkyup");     }     if (e.keycode == keyboard.d)     {         klt = false;         //trace("unklt");     }     if (e.keycode == keyboard.s)     {         kdn = false;         //trace("unkdn");     } }  stage.addeventlistener(event.enter_frame,initgame);   function loop(e:event):void {     if (krt)     {         speedx = -5;     }     else if (klt)     {         speedx = 5;     }     else     {         speedx *=  0.5;     }      player.x +=  speedx;      (i=0; i<level.length; i++)     {         if (player.getrect(this).intersects(level[i]))         {             if (speedx> 0)             {                 player.x = level[i].left - player.width / 2;              }             if (speedx < 0)             {                 player.x = level[i].right + player.width / 2;             }             speedx = 0;         }      }      var jumpable:boolean = false;     speedy +=  1;      player.y +=  speedy;      (i=0; i<level.length; i++)     {         if (player.getrect(this).intersects(level[i]))         {             if (speedy > 0)             {                 player.y = level[i].top - player.height / 2;                 speedy = 0;                 jumpable = true;                 //player.gotoandstop("jump");              }             if (speedy < 0)             {                 player.y = level[i].bottom + player.height / 2;                 speedy *=  -0.5;             }         }     }     (var j:int=0; j<cn_arr.length; j++)     {         if ((cn_arr[j]).hittestobject(player))         {             removechild(cn_arr[j]);             //removechild(cn_arr[j]);             score +=  2;             //var a:string=scr.tostring();             scoreboard.txt.text = score.tostring();              //score.x=50;           }     }     if (kup && jumpable)     {         speedy = -15;     }       if(player.hittestobject(ground))     {         removechild(player);         addchild(rep);         rep.x=stage.stagewidth/2;         rep.y=stage.stageheight/2;          rep.btn_re.addeventlistener(mouseevent.click,oncl);          function oncl(e:mouseevent):void         {             removechild(rep);             addchild(player);             player.x=166;             player.y=205;         }     }     scoreboard.x = camera.x + 280;     scoreboard.y = camera.y + 370;     /*trace(scoreboard.y + " score");     trace(camera.y);*/      camera.x = (player.x - camera.width+150);     camera.y = (player.y - camera.height+250);        if (camera.x >= 2000)     {         camera.x = 2000;     }      if (camera.x <= 0)     {         camera.x = 0;     }     if (camera.y >= 0)     {         camera.y = 0;     }     if (camera.y <= -610)     {         camera.y = -610;     }     scrollrect = camera;  }      enter code here

this error means child try remove not present in display list. everywhere use (for example) displayobject.removechild(child); should first check if (displayobject.contains(child)) { // removal }. fix error.


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