Fatal error: Uncaught Error: Call to undefined function path_join() in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-waitlist/eventon-rsvp-waitlist.php:68 Stack trace: #0 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-waitlist/eventon-rsvp-waitlist.php(39): EVORSW->super_init() #1 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-waitlist/eventon-rsvp-waitlist.php(32): EVORSW->__construct() #2 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-waitlist/eventon-rsvp-waitlist.php(137): EVORSW::instance() #3 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-waitlist/eventon-rsvp-waitlist.php(141): EVORSW() #4 {main} thrown in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-waitlist/eventon-rsvp-waitlist.php on line 68