Fatal error: Uncaught Error: Interface 'Magento\Framework\Api\ExtensibleDataInterface' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-downloadable/Api/Data/SampleInterface.php:15 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-downloadable/Api/Data/SampleInterface.php on line 15