Fatal error: Uncaught Error: Interface "Magento\Catalog\Model\Attribute\LockValidatorInterface" not found in /home/airtimer/public_html/vendor/magento/module-configurable-product/Model/Attribute/LockValidator.php:17 Stack trace: #0 {main} thrown in /home/airtimer/public_html/vendor/magento/module-configurable-product/Model/Attribute/LockValidator.php on line 17