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