Fatal error: Uncaught Error: Interface "Magento\Checkout\Block\Checkout\LayoutProcessorInterface" not found in /var/www/magento/html/app/code/Amasty/Rules/Block/Cart/LayoutProcessor.php:17 Stack trace: #0 {main} thrown in /var/www/magento/html/app/code/Amasty/Rules/Block/Cart/LayoutProcessor.php on line 17