Hello ! I have a "Drag and drop question with lines" question that doesn't cause any problem when there is a mistake, but if all 5 links are connected properly, "finishing" the question brings an error page. But there is no info, no trace, nothing to help debugging. I looked at the server logs and I cannot see anything there. Is there a way for me to determine what went wrong ? Thanks :D
Did you check the logs inside Drupal?