Cannot find module 'react-dev-utils/crossSpawn' exception React App

场景：在下载完插件fetch-jsonp(cnpm install fetch-jsonp  --save)出现以下错误

internal/modules/cjs/loader.js:582
    throw err;
    ^

Error: Cannot find module 'react-dev-utils/crossSpawn'
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:580:15)
    at Function.Module._load (internal/modules/cjs/loader.js:506:25)
    at Module.require (internal/modules/cjs/loader.js:636:17)
    at require (internal/modules/cjs/helpers.js:20:18)
    at Object. (D:\Projects\ReactProjects\create-react-app-master\packages\react-scripts\bin\react-scripts.js:18:15)
    at Module._compile (internal/modules/cjs/loader.js:688:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:699:10)
    at Module.load (internal/modules/cjs/loader.js:598:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:537:12)
    at Function.Module._load (internal/modules/cjs/loader.js:529:3)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @ start: `cd packages/react-scripts && node bin/react-scripts.js start`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the @ start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?

解决办法：

删除node_modules文件夹 并且运行 "npm install"