Fatal error: Uncaught Error: Call to undefined function path_join() in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-invitees/eventon-rsvp-invitees.php:67 Stack trace: #0 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-invitees/eventon-rsvp-invitees.php(38): evorsi->super_init() #1 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-invitees/eventon-rsvp-invitees.php(32): evorsi->__construct() #2 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-invitees/eventon-rsvp-invitees.php(143): evorsi::instance() #3 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-invitees/eventon-rsvp-invitees.php(147): EVORSI() #4 {main} thrown in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp-invitees/eventon-rsvp-invitees.php on line 67