[LayaAir 2.0]Resources already exist,is repeated loading 加载特效报重复加载

export default class TransformDemo{
    private scene:Laya.Scene3D;
    private position:Laya.Vector3 = new Laya.Vector3(0, 0, 0);
    private position1:Laya.Vector3 = new Laya.Vector3(0, 0, 0);
    private rotate:Laya.Vector3 = new Laya.Vector3(0, 1, 0);
    private scale:Laya.Vector3 = new Laya.Vector3();
    private rotate1:Laya.Vector3 = new Laya.Vector3(0, 0, 0);
    private scaleDelta:number = 0;
    private scaleValue:number = 0;
        
    private layaMonkey_clone1:Laya.Sprite3D;
    private layaMonkey_clone2:Laya.Sprite3D;
    private layaMonkey_clone3:Laya.Sprite3D; 
    private clone1Transform:Laya.Transform3D;
    private clone2Transform:Laya.Transform3D;
    private clone3Transform:Laya.Transform3D;
    private sp: Laya.Particle2D;
    private sp3d: Laya.Sprite3D;
    constructor(){
        //初始化引擎
        Laya3D.init(1134,640);
        Laya.stage.scaleMode = Laya.Stage.SCALE_FULL;
        Laya.stage.screenMode = Laya.Stage.SCREEN_NONE;
        //显示性能面板
        Laya.Stat.show();
            
        //创建场景
        this.scene = new Laya.Scene3D();
        Laya.stage.addChild(this.scene);
           
        //添加相机
        var camera = new Laya.Camera(0, 0.1, 100);
        this.scene.addChild(camera);
        camera.transform.translate(new Laya.Vector3(0, 2, 4));
        camera.transform.rotate(new Laya.Vector3( -15, 0, 0), true, false);
        camera.addComponent(CameraMoveScript);
            
        //添加光照
        var directionLight= new Laya.DirectionLight();
        this.scene.addChild(directionLight);
        directionLight.color = new Laya.Vector3(1, 1, 1);
        directionLight.transform.rotate(new Laya.Vector3( -3.14 / 3, 0, 0));
            
        //灯光开启阴影
        directionLight.shadow = true;
        //可见阴影距离
        directionLight.shadowDistance = 3;
        //生成阴影贴图尺寸
        directionLight.shadowResolution = 2048;
        //生成阴影贴图数量
        directionLight.shadowPSSMCount = 1;
        //模糊等级,越大越高,更耗性能
        directionLight.shadowPCFType = 3; 
    //  批量预加载资源
        // Laya.loader.create([
        //  "res/threeDimen/staticModel/grid/plane.lh",
        //  "res/threeDimen/skinModel/LayaMonkey/LayaMonkey.lh",
        // //   "res/threeDimen/particle/RadiusMode.lh",
        //  "res/particles/RadiusMode.part",
        //  "res/threeDimen/particle/ETF_Eternal_Light.lh" 
        // ], Laya.Handler.create(this, this.onComplete));
        //this.onComplete()
        console.log("11111111111")
        Laya.loader.load("res/threeDimen/particle/2d.lh", Handler.create(this, this.onAssetsLoaded), null, Loader.JSON);
    } 
    public onAssetsLoaded(settings: ParticleSetting): void {
        this.sp = new Particle2D(settings);
        this.sp.emitter.start();
        this.sp.play();
        Laya.stage.addChild(this.sp); 
        this.sp.x = Laya.stage.width / 2;
        this.sp.y = Laya.stage.height / 2;
    } }
打印的报错：
11111111111
TransformDemo.ts:73
Resources already exist,is repeated loading: D:/myLaya/myLaya/bin/res/threeDimen/particle/2d.lh
laya.core.js:16639
[warn]Retry to load: null
laya.core.js:14865
Resources already exist,is repeated loading: D:/myLaya/myLaya/bin/res/threeDimen/particle/2d.lh
laya.core.js:16639
[error]Failed to load: null 为什么加载自己从unity导出的特效会报已经存在不能重复加载？从打印的1111来看加载方法只调用过一次，但是用官方给的特效就不会报错 particleNew.part