title: exception when debugging opencart 3
body: <p>I'm trying to debug an opencart 3 app with a theme built on it using twig.
  When the app starts, the <code>twig/Autoloader.php</code> throws an exception:</p>
  
  <blockquote>
    <p>The Twig_Autoloader class is deprecated since version 1.21 and will be removed in 2.0. Use Composer instead.</p>
  </blockquote>
  
  <p>any ideas?</p>