title: How to get nightwatchjs screenshots working?
body: <p>I am trying to generate a screenshot with nightwatch js , it saves a file to my location but the size is 1kb and when I try to open this there is no image. The config file is the one I got from <a href="https://www.npmjs.com/package/learn-nightwatch" rel="nofollow noreferrer">https://www.npmjs.com/package/learn-nightwatch</a>.
  What could be the culprit?</p>