« 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 Captcha::askapache_captcha() should not be called statically, assuming $this from incompatible context 
  Error type/ Nr.: - 2048 
  File: /home/raidsavemx/www/assets/snippets/contact/contact.inc.php 
  Line: 26 
  Line 26 source: Captcha::askapache_captcha('0','4','17');  
 
Parser timing
  MySQL: 0.0123 s(4 Requests)
  PHP: 0.2046 s 
  Total: 0.2170 s