« MODx Parse Error »

MODx encountered the following error while attempting to parse the requested resource:
« PHP Parse Error »
PHP error debug
  Error: simplexml_load_file(http://www.vimeo.com/api/oembed.xml?url=http%3A%2F%2Fwww.vimeo.com%2F13820858&width=600&byline=0&title=0&portrait=0&color=83C03C) [function.simplexml-load-file]: failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found  
  Error type/ Nr.: Warning - 2 
  File: /homepages/9/d213892450/htdocs/diverseleaders/assets/snippets/video.php 
  Line: 21 
  Line 21 source: $oembed = simplexml_load_file($xml_url);  
Parser timing
  MySQL: 0.0031 s(0 Requests)
  PHP: 0.3836 s 
  Total: 0.3866 s