« MODx Parse Error »

MODx encountered the following error while attempting to parse the requested resource:
« PHP Parse Error »
 
PHP error debug
  Error: EXEC functions have been disabled for security reasons 
  Error type/ Nr.: Warning - 2 
  File: /home/doctorg/UE8WV5YG/htdocs/modx/assets/plugins/slimstat/_functions.php 
  Line: 456 
  Line 456 source: $host = shell_exec( "host -W 1 ".$_ip );  
 
Parser timing
  MySQL: 0.1261 s(43 Requests)
  PHP: 0.1804 s 
  Total: 0.3065 s