一个错误，请高手帮我看看

[snnui85]

cc.resources.load(path, cc.SpriteAtlas, (err, atlas:cc.SpriteAtlas) => {

            if (err){

                cc.log(err)

            }

            this.myres = atlas;

            let spriteFrames = atlas.getSpriteFrames();

            sprite.spriteFrame = spriteFrames[0];

            let obj = [];

            // let clips = [];

            for (let i = 0; i < spriteFrames.length; i++)

            {

                let lastIndex =  spriteFrames[i].name.lastIndexOf("_");

                let str = spriteFrames[i].name.substring(0, lastIndex);

                if (obj[str] == null)

                {

                    obj[str] = [];

                }

                obj[str].push(spriteFrames[i]);

            }

            let index = 0;

            for (let key in obj)

            {

                let sample = 0;

                if (obj[key].length < 5)

                    sample = 5;

                else

                    sample = 10;

                

                let clip = cc.AnimationClip.createWithSpriteFrames(obj[key], sample);

                clip.name = this.actionName[index];

                if (index < 5 || index > 9)

                {

                    clip.speed = 1;

                    clip.wrapMode = cc.WrapMode.Loop;

                }

                else

                {

                    clip.speed = 1.2;

                    clip.wrapMode = cc.WrapMode.Normal;

                }

                // clips.push(clip);

       

                animation.addClip(clip);

                index ++;

            }

            animation.play('stand_down');

            this.node.active = true;

            this.node.getComponent(MONSTER).player_ani = animation;

        });

    }

[snnui85]

这是一个通过代码把图片写成动画的，有时候会报这个错误，看不明白是什么错误