Fatal error: Uncaught Error: Class "Bitrix\Main\Entity\DataManager" not found in D:\ktt\ttepla.com\public_html\bitrix\modules\calendar\lib\internals\section.php:56 Stack trace: #0 {main} thrown in D:\ktt\ttepla.com\public_html\bitrix\modules\calendar\lib\internals\section.php on line 56