Fatal error: Uncaught Exception: Database connection details not defined. in /var/www/html/modeer/classes/MysqliDb.php:17 Stack trace: #0 /var/www/html/modeer/classes/classes.php(9): include_once() #1 /var/www/html/modeer/index.php(35): include('...') #2 {main} thrown in /var/www/html/modeer/classes/MysqliDb.php on line 17