Fatal error: Uncaught Error: Class "Magento\ProductAlert\Controller\Add" not found in /home/airtimer/public_html/vendor/magento/module-product-alert/Controller/Unsubscribe.php:8 Stack trace: #0 {main} thrown in /home/airtimer/public_html/vendor/magento/module-product-alert/Controller/Unsubscribe.php on line 8