[LayaAirIDE 2.0]new Laya.TiledMap()提示错误：Laya.TiledMap is not a constructor

class GameMain{

    private tMap:Laya.TiledMap;



    constructor()

    {

        Laya.init(Laya.Browser.width, 224, Laya.WebGL);



        this.tMap = new Laya.TiledMap();

        var viewRect: Laya.Rectangle = new Laya.Rectangle();



        this.tMap.createMap("../bin/res/MarioMap1.json", viewRect, Laya.Handler.create(this,this.initMap));

    }



    private initMap(): void {



    }

}



new GameMain();