Fatal error: Uncaught Error: Call to undefined function add_action() in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-weekly-view/eventon-weekly-view.php:37 Stack trace: #0 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-weekly-view/eventon-weekly-view.php(30): eventon_weeklyview->__construct() #1 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-weekly-view/eventon-weekly-view.php(104): eventon_weeklyview::instance() #2 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-weekly-view/eventon-weekly-view.php(105): EVOWV() #3 {main} thrown in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-weekly-view/eventon-weekly-view.php on line 37