Fatal error: Uncaught Error: Class 'Magento\Downloadable\Controller\Adminhtml\Downloadable\File' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-downloadable/Controller/Adminhtml/Downloadable/File/Upload.php:18 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-downloadable/Controller/Adminhtml/Downloadable/File/Upload.php on line 18