Fatal error: Uncaught Error: Interface 'Magento\Catalog\Api\ProductLinkManagementInterface' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-catalog/Model/ProductLink/Management.php:19 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-catalog/Model/ProductLink/Management.php on line 19