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