Fatal error: Uncaught Error: Interface "Magento\Framework\Config\SchemaLocatorInterface" not found in /home/airtimer/public_html/vendor/magento/framework/Config/GenericSchemaLocator.php:15 Stack trace: #0 {main} thrown in /home/airtimer/public_html/vendor/magento/framework/Config/GenericSchemaLocator.php on line 15