Fatal error: Uncaught Error: Class "Bitrix\Main\Update\Stepper" not found in D:\ktt\ttepla.com\public_html\bitrix\modules\forum\lib\internals\messagecleaner.php:8 Stack trace: #0 {main} thrown in D:\ktt\ttepla.com\public_html\bitrix\modules\forum\lib\internals\messagecleaner.php on line 8