Ein Fehler vom Typ E_ERROR wurde in der Zeile 36 der Datei

I get an issue

Issue-Details
==============
Ein Fehler vom Typ E_ERROR wurde in der Zeile 36 der Datei /home/wp/disk/wordpress/wp-content/plugins/wp-event-manager/templates/event-listings-start.php verursacht. Fehlermeldung: Uncaught Error: Call to undefined function get_event_registration_count() in /home/wp/disk/wordpress/wp-content/plugins/wp-event-manager/templates/event-listings-start.php:36
Stack trace:
#0 /home/wp/disk/wordpress/wp-content/plugins/wp-event-manager/wp-event-manager-template.php(42): include()
#1 /home/wp/disk/wordpress/wp-content/plugins/wp-event-manager/shortcodes/wp-event-manager-shortcodes.php(1621): get_event_manager_template()
#2 /home/wp/disk/wordpress/wp-includes/shortcodes.php(434): WP_Event_Manager_Shortcodes->output_upcoming_events()
#3 [internal function]: do_shortcode_tag()
#4 /home/wp/disk/wordpress/wp-includes/shortcodes.php(273): preg_replace_callback()
#5 /home/wp/disk/wordpress/wp-content/plugins/wp-event-manager/external/elementor-widgets/elementor-upcoming-event-listing.php(201): do_shortcode()
#6 /home/wp/disk/wordpress/wp-content/plugins/elementor/includes/base/controls-stack.php(2325): WPEventManager\Widgets\Elementor_Upcoming_Event_Listing->render()
#7 /home/wp/disk/wordpress/wp-conte