平时用yarn运行项目的时候没问题，印象中也没有修改代码。然后某一天，控制台输入yarn start运行项目，报错Failed to compile：
i ｢wds｣: Project is running at http://10.8.78.100/
i ｢wds｣: webpack output is served from
i ｢wds｣: Content not from webpack is served from D:\exteriorsprayingrobot\yarn_react\public
i ｢wds｣: 404s will fallback to /
Error: [BABEL] D:…js: EIO: i/o error, read (While processing: “D:\…\yarn_react\node_modules\babel-preset-react-app\index.js”)
具体如图
解决方法：控制台输入npm install @babel/core @babel/preset-env，再重新yarn start即可运行。