[]载入场景报错

从unity导出场景，只有maincamera 和light，所有代码如下

import Handler=laya.utils.Handler;

import Loader=laya.net.Loader;

// 程序入口

class GameMain {

    constructor() {

        Laya.init(600, 400);



        Laya.stage.scaleMode = Laya.Stage.SCALE_EXACTFIT;

        Laya.stage.screenMode = Laya.Stage.SCREEN_VERTICAL;

        Laya.stage.alignH = Laya.Stage.ALIGN_CENTER;

        Laya.stage.alignV = Laya.Stage.ALIGN_MIDDLE;

        console.log("load");



        Laya.loader.create("TestScene/TestScene.ls", Laya.Handler.create(this, this.LoadSceneComplete));

    }



    LoadSceneComplete() {

        console.log("finish")

        let scene: Laya.Scene = Laya.loader.getRes("TestScene/TestScene.ls") as Laya.Scene;

        // scene.enableLight = true;



        Laya.stage.addChild(scene);

    }

}

new GameMain();

工程文件在附件，运行后报错
Uncaught Error: LoaderManager:unknown file(G:/LayaTest/bin/TestScene/TestScene.ls) extension with: ls.
    at LoaderManager.__proto._create (laya.core.js:12387)
    at LoaderManager.__proto.create (laya.core.js:12375)
    at new GameMain (LayaSample.ts:14)
    at LayaSample.ts:25
 
能麻烦看看是什么原因吗