Hello, I'm beginner. I have a problem with Flash builder (AS). This group can help me, I think. I was trying to create actionscript game, already had a 2 class file, and first can call second class, it was worked. But suddenly cannot call second class. I have any changes of two class file, suddenly run debug, then cannot call other class. I don't know what I must to do. Hope you guys can help me or can tell me where can I take some help. Thanks for advance. Regards There is code : import flash.display.Sprite;import flash.utils.*;import flash.events.Event; [SWF(width = '730', height = '420', backgroundColor = '#FFFFFF', frameRate = '30')]//worked, so I think first class is OK,public class index extends Sprite{ private var cell_size:int = 21; private var maptile:int = 38; //this is tiled map named other class. map is class object private var map:tiledmap; public function index() { addEventListener(Event.ADDED_TO_STAGE, init); } private function init(e:Event = null):void { removeEventListener(Event.ADDED_TO_STAGE, init); //tiledmap constuctor method take cellsize and maptile count map = new tiledmap(cell_size, maptile); //then add map to sprite of index class addChild(map); }} tiledmap class: import flash.display.Sprite; import flash.events.Event; import flash.events.MouseEvent; import flash.utils.*; public class tiledmap extends Sprite { public function tiledmap(cell_size:int, maptile:int) { //draw some tiled map 38x38 width and height is 21. ... } }