Fatal error: Uncaught Error: Interface 'Magento\Catalog\Model\Product\CopyConstructorInterface' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-downloadable/Model/Product/CopyConstructor/Downloadable.php:8 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-downloadable/Model/Product/CopyConstructor/Downloadable.php on line 8