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