Fatal error: Uncaught Error: Interface "Magento\ConfigurableProduct\Pricing\Price\PriceResolverInterface" not found in /home/airtimer/public_html/vendor/magento/module-configurable-product/Pricing/Price/RegularPriceResolver.php:9 Stack trace: #0 {main} thrown in /home/airtimer/public_html/vendor/magento/module-configurable-product/Pricing/Price/RegularPriceResolver.php on line 9