« MODx Parse Error »

MODx encountered the following error while attempting to parse the requested resource:
« PHP Parse Error »
 
PHP error debug
  Error: require_once(../assets/classes/amlibrary.class.php): failed to open stream: No such file or directory 
  Error type/ Nr.: Warning - 2 
  File: /www/manager/includes/document.parser.class.inc.php 
  Line: 1292 
  Line 1292 source: require_once('../assets/classes/amlibrary.class.php');  
 
Parser timing
  MySQL: 0.0164 s(28 Requests)
  PHP: 0.3159 s 
  Total: 0.3323 s 
Warning: require_once(../assets/classes/amlibrary.class.php): failed to open stream: No such file or directory in /www/manager/includes/document.parser.class.inc.php on line 1292 Fatal error: require_once(): Failed opening required '../assets/classes/amlibrary.class.php' (include_path='.:/usr/local/pear') in /www/manager/includes/document.parser.class.inc.php on line 1292