無法解決 React 啟動的報錯

E:\React\react_blank>npm start

> react_blank@0.1.0 start E:\React\react_blank
> react-scripts start

Could not find a required file.
  Name: index.js
  Searched in: E:\React\react_blank\src  掃描src
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! react_blank@0.1.0 start: `react-scripts start`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the react_blank@0.1.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     D:\Program Files\nodejs\node_cache\_logs\2018-12-29T06_12_40_683Z-debug.log

因為我把src 名字改掉了。重新改回來就可以解決問題。