Fatal error: Uncaught Error: Class "Amasty\Rules\Model\Rule\Action\Discount\AbstractRule" not found in /var/www/magento/html/app/code/Amasty/Rules/Model/Rule/Action/Discount/GroupnDisc.php:19 Stack trace: #0 {main} thrown in /var/www/magento/html/app/code/Amasty/Rules/Model/Rule/Action/Discount/GroupnDisc.php on line 19