title: (nodemon) app crashed - waiting for file changes before starting
body: <p>I cloned this <a href="https://github.com/FarmBot/mqtt-gateway" rel="nofollow noreferrer">repo</a> from gitHub so, while installing in the last step I try to run this command: </p>
  
  <p><code>~/mqtt-gateway$ WEB_API_URL=http://localhost:3000 npm start</code></p>
  
  <p>And I get this error:</p>
  
  <p><code>[nodemon] app crashed - waiting for file changes before starting...</code></p>
  
  <p>I've read that possibly is because of a process that haven't been terminated but I've been unable to solve it.</p>
  
  <p>Hope you can help. Thank you ;)</p>