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