ok here is what happened:

dir=/phpBB2/
link_enabled_admin_status=true
FAILURE: phpBB NOT activated


Warning: session_start(): Cannot send session cookie - headers already sent by (output started at /var/www/html/includes/classes/sniffer.php:58) in /var/www/html/includes/functions/sessions.php on line 111

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /var/www/html/includes/classes/sniffer.php:58) in /var/www/html/includes/functions/sessions.php on line 111