title: Ionic black screen on "ionic serve --lab"
body: <p>I'm working with Ionic v3. When I put in terminal <code>ionic serve --lab</code> this opens Google Chrome, but a blank black page appears, with an error in the console like this:</p>
  
  <p><code>Failed to load resource: the server responded with a status of 404 (Not Found)
  :8200/build/app/app.jcrhwwkm.js:1</code></p>
  
  <p><a href="https://i.stack.imgur.com/Zpg5q.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Zpg5q.png" alt="enter image description here"></a></p>