Fatal error: Uncaught Error: Class "Bitrix\Main\ORM\Data\DataManager" not found in D:\ktt\ttepla.com\public_html\bitrix\modules\im\lib\model\chatpinnedmessage.php:42
Stack trace:
#0 {main}
thrown in D:\ktt\ttepla.com\public_html\bitrix\modules\im\lib\model\chatpinnedmessage.php on line 42