Fatal error: Uncaught Error: Class "mysqli" not found in /var/www/html/db.php:50 Stack trace: #0 /var/www/html/site_bootstrap.php(64): require_once() #1 /var/www/html/attendance_roulette.php(2): require_once('...') #2 {main} thrown in /var/www/html/db.php on line 50