Fatal error: Uncaught Error: Interface 'Magento\Cms\Api\GetBlockByIdentifierInterface' not found in /home/esecureh/public_html/magdemo/vendor/magento/module-cms/Model/GetBlockByIdentifier.php:16 Stack trace: #0 {main} thrown in /home/esecureh/public_html/magdemo/vendor/magento/module-cms/Model/GetBlockByIdentifier.php on line 16