title: sh: react-scripts: command not found after running npm start
body: <p>I cloned a react application onto my system and ran following commands</p>
  
  <pre><code>npm install -g create-react-app
  npm install --save react react-dom
  </code></pre>
  
  <p>After that i ran </p>
  
  <pre><code>npm start 
  </code></pre>
  
  <p>But it threw the above mentioned error, It is working fine on my other system from which i pushed it on github. But it is not working on any other system after cloning whether windows or mac.</p>