title: node_modules appears empty, you may need to run `npm install`
body: <p>I have cloned an Angular 4 project from git.</p>
  <p>When I go to the root folder of the project and executed <code>ng serve</code>.</p>
  <p>I am getting following error:</p>
  <pre><code>node_modules appears empty, you may need to run `npm install`
  </code></pre>
  <p>How can I fix the above error?</p>