Fatal error: Uncaught Error: Undefined constant "APP_SLUG" in /var/www/html/reserve/hotelname/inc/config.php:165 Stack trace: #0 /var/www/html/reserve/hotelname/reserve_follow.php(2): require() #1 {main} thrown in /var/www/html/reserve/hotelname/inc/config.php on line 165