Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, class "DB" not found in /var/www/kosimen/admin/view/list.php:39 Stack trace: #0 /var/www/kosimen/admin/view/main.php(369): require_once() #1 {main} thrown in /var/www/kosimen/admin/view/list.php on line 39