[LayaAir 2.0]为什么新建一个项目后，什么都没添加，直接点运行就报错？？

laya.core.js:23023 Access to XMLHttpRequest at 'file:///Users/andyzu/Desktop/LayaGame/demo/myLaya/bin/version.json' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, chrome, chrome-extension, https.
__proto.send @ laya.core.js:23023
laya.core.js:23075 /Users/andyzu/Desktop/LayaGame/demo/myLaya/bin/version.json Request failed Status:0 text:
__proto.error @ laya.core.js:23075
laya.core.js:25049 [warn]Retry to load: version.json
 
为什么直接就出现跨域的问题？啥素材都没加，啥代码都没写！