Fatal error: Uncaught Error: Class 'Tribe__Events__Aggregator__Tabs__Abstract' not found in /home/www/sieml/wp-content/plugins/the-events-calendar/src/Tribe/Aggregator/Tabs/Edit.php:3 Stack trace: #0 {main} thrown in /home/www/sieml/wp-content/plugins/the-events-calendar/src/Tribe/Aggregator/Tabs/Edit.php on line 3