using 1.8.12 version without problem, so I upgraded to 1.9.3 and because I was seeing error unable to modify header information, I did a fresh install, but I continue to see this bug. When I log in, it is ok, but when I click any button in Staff Panel, I see this error. The osticket is working OK, but it is annoying for the users.Any Idea where the problem should be?PetrWarning: Cannot modify header information - headers already sent by (output started at /data/www/osticket/include/staff/header.inc.php) in /data/www/osticket/include/staff/header.inc.php on line 80