Fatal error: Uncaught Error: mysqli object is already closed in /var/www/university/_admin/x-connect.php:27 Stack trace: #0 /var/www/university/_admin/x-connect.php(27): mysqli_query(Object(mysqli), 'select * from `...') #1 /var/www/university/index.php(2): include_once('/var/www/univer...') #2 {main} thrown in /var/www/university/_admin/x-connect.php on line 27