Fatal error: Uncaught Error: Class 'TEC\Common\Integrations\Integration_Abstract' not found in /mysite/web/wp-content/plugins/the-events-calendar/src/Events/Integrations/Integration_Abstract.php:17 Stack trace: #0 {main} thrown in /mysite/web/wp-content/plugins/the-events-calendar/src/Events/Integrations/Integration_Abstract.php on line 17