Fatal error: Uncaught Error: Class 'Yoast\WP\SEO\Generators\Schema\Abstract_Schema_Piece' not found in /home/www/sieml/wp-content/plugins/the-events-calendar/src/Events/Integrations/Plugins/WordPress_SEO/Events_Schema.php:21 Stack trace: #0 {main} thrown in /home/www/sieml/wp-content/plugins/the-events-calendar/src/Events/Integrations/Plugins/WordPress_SEO/Events_Schema.php on line 21