Fatal error: Uncaught Error: Interface "Magento\Framework\Api\ExtensionAttributesInterface" not found in /var/www/magento/html/generated/code/Magento/SalesRule/Api/Data/CouponGenerationSpecExtensionInterface.php:7 Stack trace: #0 {main} thrown in /var/www/magento/html/generated/code/Magento/SalesRule/Api/Data/CouponGenerationSpecExtensionInterface.php on line 7