Reboot and disaster

Warning: Cannot modify header information - headers already sent by (output started at C:\Program Files\xampp\htdocs\modx\manager\includes\document.parser.class.inc.php:466) in C:\Program Files\xampp\htdocs\modx\manager\includes\document.parser.class.inc.php on line 430
« 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 C:\Program Files\xampp\htdocs\modx\manager\includes\document.parser.class.inc.php:466)	 
  Error type/ Nr.: 	Warning - 2	 
  File: 	C:\Program Files\xampp\htdocs\modx\manager\includes\document.parser.class.inc.php	 
  Line: 	430	 
  Line 430 source: 	header($header);