title: Exporting big liferay portal into LAR-file fails with no sensible error message
body: <p>I'm using liferay portal community edition 6.1-</p>
  
  <p>I'm trying to export a portal in order to move the content to another intance of liferay. however, when trying to export the portal content the export fails with message 'Your request failed to complete." </p>
  
  <p>When looking at log files, there is no sign of anything going wrong.</p>
  
  <p>Could someone please explain to me what can possibly be wrong, and from where should I get the information for what is failing on server?</p>
  
  <hr>
  
  <p>Marko</p>