title: Cannot find module '../config/env Failed at 0.1.0 start script
body: <p>it was working fine yesterday i don't know what happened npm is not starting instead giving the above error. 
      help me pls..</p>
  
  <p>npm start scripts not working pls someone help me i'm new to this field </p>
  
  <pre><code>Husnains-Mini:~ husnaintahir$ cd ReactApp
  Husnains-Mini:ReactApp husnaintahir$ cd react-complete-guide
  Husnains-Mini:react-complete-guide husnaintahir$ npm start
  
  &gt; react-complete-guide@0.1.0 st art /Users/husnaintahir/ReactApp/react-complete-guide
  &gt; node scripts/start.js
  
  module.js:549
      throw err;
      ^
  
  Error: Cannot find module '../config/env'
      at Function.Module._resolveFilename (module.js:547:15)
      at Function.Module._load (module.js:474:25)
      at Module.require (module.js:596:17)
      at require (internal/module.js:11:18)
      at Object.&lt;anonymous&gt; (/Users/husnaintahir/ReactApp/react-complete-guide/scripts/start.js:15:1)
      at Module._compile (module.js:652:30)
      at Object.Module._extensions..js (module.js:663:10)
      at Module.load (module.js:565:32)
      at tryModuleLoad (module.js:505:12)
      at Function.Module._load (module.js:497:3)
  npm ERR! code ELIFECYCLE
  npm ERR! errno 1
  npm ERR! react-complete-guide@0.1.0 start: `node scripts/start.js`
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the react-complete-guide@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!     /Users/husnaintahir/.npm/_logs/2019-05-22T04_42_05_832Z-debug.log
  Husnains-Mini:react-complete-guide husnaintahir$ 
  </code></pre>