Fatal error: Uncaught Error: Class "Zendesk\API\ClientAbstract" not found in /var/www/html/includes/zendesk/src/Zendesk/API/TopicSubscriptions.php:9 Stack trace: #0 {main} thrown in /var/www/html/includes/zendesk/src/Zendesk/API/TopicSubscriptions.php on line 9