title: Error after upgrading to Apache 2.4.6
body: <p>The "a2ensite""a2dissite" are not working</p>
  
  <p>Echo:</p>
  
  <blockquote>
    <p>ERROR: Site XXXXXX does not exist!</p>
  </blockquote>
  
  <p>I swear it exists in sites-available folder.</p>
  
  <p>After I typed <code>a2ensite</code> and double clicked the <kbd>Tab</kbd> button, it shows the <code>/root</code> directory.</p>
  
  <p>There must be something wrong with the a2en/dissite script.</p>
  
  <p>How can I make it back to work?</p>
  
  <p>=====================
  Here are the last lines of the error log:</p>
  
  <pre><code>[Sun Aug 04 22:59:31.406192 2013] [mpm_event:notice] [pid 5378:tid 140459282536256] AH00489: Apache/2.4.6 (Ubuntu) configured -- resuming normal operations
  [Sun Aug 04 22:59:31.406433 2013] [core:notice] [pid 5378:tid 140459282536256] AH00094: Command line: '/usr/sbin/apache2'
  [Sun Aug 04 23:09:44.648984 2013] [mpm_event:notice] [pid 5378:tid 140459282536256] AH00491: caught SIGTERM, shutting down
  [Sun Aug 04 23:09:46.001182 2013] [mpm_event:notice] [pid 5692:tid 139671144335168] AH00489: Apache/2.4.6 (Ubuntu) configured -- resuming normal operations
  [Sun Aug 04 23:09:46.001490 2013] [core:notice] [pid 5692:tid 139671144335168] AH00094: Command line: '/usr/sbin/apache2'
  </code></pre>