« MODx Parse Error »

MODx encountered the following error while attempting to parse the requested resource:
« PHP Parse Error »
PHP error debug
  Error: file_get_contents(http://app3.naag.org/refeed/env/out/rss.php?user=1&itemtag=WaterContactItem): failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found  
  Error type/ Nr.: Warning - 2 
  File: /var/lib/apache/htdocs/www.naag.org/assets/snippets/FeedX/classes/feedx.class.inc.php 
  Line: 291 
  Line 291 source: $xml = file_get_contents($this->config['url']);  
Parser timing
  MySQL: 0.0045 s(1 Requests)
  PHP: 0.7445 s 
  Total: 0.7490 s