Fatal error: Uncaught Error: Call to undefined function is_admin() in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp/eventon-rsvp.php:171 Stack trace: #0 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp/eventon-rsvp.php(73): EventON_rsvp->load_plugin_textdomain() #1 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp/eventon-rsvp.php(46): EventON_rsvp->super_init() #2 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp/eventon-rsvp.php(39): EventON_rsvp->__construct() #3 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp/eventon-rsvp.php(221): EventON_rsvp::instance() #4 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp/eventon-rsvp.php(222): EVORS() #5 {main} thrown in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-rsvp/eventon-rsvp.php on line 171