Fatal error: Uncaught Error: Class "Bitrix\UI\EntitySelector\BaseProvider" not found in D:\ktt\ttepla.com\public_html\bitrix\modules\im\lib\integration\ui\entityselector\recentchatprovider.php:11 Stack trace: #0 {main} thrown in D:\ktt\ttepla.com\public_html\bitrix\modules\im\lib\integration\ui\entityselector\recentchatprovider.php on line 11