Fatal error: Uncaught Error: Undefined constant "PROJECT_DOCUMENT_ROOT" in /var/www/vhosts/sync25.de/httpdocs/classes/cl_session.php:2 Stack trace: #0 /var/www/vhosts/sync25.de/httpdocs/user/logout.php(3): require_once() #1 {main} thrown in /var/www/vhosts/sync25.de/httpdocs/classes/cl_session.php on line 2