Fatal error: Uncaught Error: Class "Magento\Newsletter\Controller\Manage\Save" not found in /var/www/magento/html/generated/code/Magento/Newsletter/Controller/Manage/Save/Interceptor.php:7 Stack trace: #0 {main} thrown in /var/www/magento/html/generated/code/Magento/Newsletter/Controller/Manage/Save/Interceptor.php on line 7