Recent posts/comments box stopped working

Link

My recent posts/comment box worked (see top right column) perfectly until 10 minutes ago, when it simply stopped working. This is extremely frustrating. Any ideas?

<div id="tabs_container">
    <ol class="idTabs">
      <li class="recent">Recent</li>
      <li><a href="#tab1">Forum</a></li>
      <li style="border:none;"><a href="#tab2">Comments</a></li>
    </ol>
    <div id="tab1">
      <ul>
       <?php include_once(ABSPATH.WPINC.'/rss.php');wp_rss('https://www.rushmoreacademy.com/yankeeracers/syndication.php?type=rss', 8); ?>
      </ul>
    </div>
    <div id="tab2">
      <ul>
        <?php mdv_recent_comments(); ?>
      </ul>
    </div>
  </div>