Fatal error: Uncaught Error: Undefined constant "DB_HOST" in /var/www/html/class.mysqli.php:21 Stack trace: #0 /var/www/html/class.mysqli.php(144): MySql::connect() #1 /var/www/html/classes/class.events.php(11): MySql::fetchAll('SELECT * FROM e...') #2 /var/www/html/controllers/events.php(48): Events_model::getEventsByMonth('2024-04-20') #3 /var/www/html/index.php(79): events->index() #4 {main} thrown in /var/www/html/class.mysqli.php on line 21