ReferenceError：错误＃1065：未定义变量NativeApplication

Question

  

ReferenceError：错误＃1065：变量NativeApplication不是   定义

在我导入relavnet包时显示：import flash.desktop

 import ISC.*;
    import flash.desktop.*;
    import flash.events.*;
    import flash.ui.*;

    public class Back_lst extends Object
    {
        public function Back_lst()
        {
            Game.gameLink.addEventListener(Event.DEACTIVATE, this.exit2_fnc);
            Game.gameLink.addEventListener(Event.ACTIVATE, this.return_fnc);
            NativeApplication.nativeApplication.addEventListener(KeyboardEvent.KEY_DOWN, this.exit_fnc);
            return;
        }// end function