title: Error when trying to launch an application using GTK and glade
body: <p>When we try to launch an application that uses GTK libraries of version GTK 2.0 we get the below error:</p>
  
  <blockquote>
    <p>Message: Unhandled tag: 'requires'</p>
  </blockquote>
  
  <p><code>'requires'</code> appears only once in the faulty XML file. Glade version used is <code>3.6.1</code>.</p>
  
  <p>Could you please help us with the query? Thanks.</p>