« MODx Parse Error »

MODx encountered the following error while attempting to parse the requested resource:
« PHP Parse Error »
 
PHP error debug
  Error: Non-static method pfcGlobalConfig::Instance() should not be called statically, assuming $this from incompatible context 
  Error type/ Nr.: - 2048 
  File: /var/www/com/kakadu-club/www/docroot/assets/snippets/phpfreechat/src/phpfreechat.class.php 
  Line: 44 
  Line 44 source: $c =& pfcGlobalConfig::Instance( $params );  
 
Parser timing
  MySQL: 0.0007 s(4 Requests)
  PHP: 0.0381 s 
  Total: 0.0388 s