Fatal error: Uncaught Error: Using $this when not in object context in /home/www/sieml/wp-content/plugins/the-events-calendar/src/admin-views/widgets/events-list.php:18 Stack trace: #0 {main} thrown in /home/www/sieml/wp-content/plugins/the-events-calendar/src/admin-views/widgets/events-list.php on line 18