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