Fatal error: Uncaught Error: Class 'FacebookAds\Object\ServerSide\UserData' not found in /var/www/html/app/code/Facebook/BusinessExtension/Helper/ServerEventFactory.php:28 Stack trace: #0 /var/www/html/app/code/Facebook/BusinessExtension/Helper/ServerEventFactory.php(167): Facebook\BusinessExtension\Helper\ServerEventFactory::newEvent('ViewCategory', 'fa55d1e1-9ad2-4...') #1 /var/www/html/app/code/Facebook/BusinessExtension/Observer/ViewCategory.php(51): Facebook\BusinessExtension\Helper\ServerEventFactory::createEvent('ViewCategory', Array, 'fa55d1e1-9ad2-4...') #2 /var/www/html/vendor/magento/framework/Event/Invoker/InvokerDefault.php(72): Facebook\BusinessExtension\Observer\ViewCategory->execute(Object(Magento\Framework\Event\Observer)) #3 /var/www/html/vendor/magento/framework/Event/Invoker/InvokerDefault.php(60): Magento\Framework\Event\Invoker\InvokerDefault->_callObserverMethod(Object(Facebook\BusinessExtension\Observer\ViewCategory), Object(Magento\Framework\Event\Observer)) #4 /var/www/html/vendor/magento/framewo in /var/www/html/app/code/Facebook/BusinessExtension/Helper/ServerEventFactory.php on line 28