Fatal error: Uncaught Error: Interface 'Magento\Downloadable\Api\DomainManagerInterface' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-downloadable/Model/DomainManager.php:20 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-downloadable/Model/DomainManager.php on line 20