Thread:Project:Support desk/Cannot modify header information

Hey Guys, I have the issue that I only get a blank page, so I edited the LocalSettings.php and added "error_reporting( E_ALL ); ini_set( 'display_errors', 1 );" that the page shows me what error happen. So this is my problem:

Warning: Cannot modify header information - headers already sent by (output started at /hp/cc/ab/dh/www/wiki/LocalSettings.php:1) in /hp/cc/ab/dh/www/wiki/includes/WebResponse.php on line 22

Warning: Cannot modify header information - headers already sent by (output started at /hp/cc/ab/dh/www/wiki/LocalSettings.php:1) in /hp/cc/ab/dh/www/wiki/includes/WebResponse.php on line 22

Warning: Cannot modify header information - headers already sent by (output started at /hp/cc/ab/dh/www/wiki/LocalSettings.php:1) in /hp/cc/ab/dh/www/wiki/includes/WebResponse.php on line 22

Warning: Cannot modify header information - headers already sent by (output started at /hp/cc/ab/dh/www/wiki/LocalSettings.php:1) in /hp/cc/ab/dh/www/wiki/includes/WebResponse.php on line 22

Warning: Cannot modify header information - headers already sent by (output started at /hp/cc/ab/dh/www/wiki/LocalSettings.php:1) in /hp/cc/ab/dh/www/wiki/includes/WebResponse.php on line 22

Warning: Cannot modify header information - headers already sent by (output started at /hp/cc/ab/dh/www/wiki/LocalSettings.php:1) in /hp/cc/ab/dh/www/wiki/includes/WebResponse.php on line 22

Warning: Cannot modify header information - headers already sent by (output started at /hp/cc/ab/dh/www/wiki/LocalSettings.php:1) in /hp/cc/ab/dh/www/wiki/includes/WebResponse.php on line 22

What can I change that it works? Thank you for your help!