problems when power source brake down

hello everyone!
i’m having a big problem and i don’t have a clue how to solve it.
while i was working at a site the power broke down and since then at every page of the site at the bottom appers a warning message:

W:\www\manager\includes\document.parser.class.inc.php:452) in W:\www\manager\includes\document.parser.class.inc.php on line 416
« MODx Parse Error »
MODx encountered the following error while attempting to parse the requested resource:
« PHP Parse Error »

PHP error debug
Error: Cannot modify header information - headers already sent by (output started at W:\www\manager\includes\document.parser.class.inc.php:452)
Error type/ Nr.: Warning - 2
File: W:\www\manager\includes\document.parser.class.inc.php
Line: 416
Line 416 source: header($header);

Parser timing
MySQL: 0.0617 s s (1 Requests)
PHP: 0.1007 s s
Total: 0.1625 s s

This is probably related to a known bug in the native visitor logging code. The bug only affects some specific server enviroments, so if your enviroment has changed this can happen.

You can fix it by disabling the native visitor logging from the modx manager, administration settings.