If this file is a Spine atlas, please change its extension to .atlas.txt. This is to allow Unity to recognize it and avoid filename collisions. You can also set this file extension when exporting from the Spine editor.
第一次使用Spine动画，导入美术给的资源后报错。根据提示知道，是atlas文件需要改成 .atlas.txt 的后缀名。改了就好了
Spine动画插件感觉很牛逼的样子，看看官方unity包里面的示例，能实现各种不错的效果。API也非常的简洁好用