Fatal error: Uncaught Error: Call to undefined function Bitrix\Calendar\ICal\MailInvitation\IncludeModuleLangFile() in D:\ktt\ttepla.com\public_html\bitrix\modules\calendar\lib\ical\mailinvitation\helper.php:26 Stack trace: #0 {main} thrown in D:\ktt\ttepla.com\public_html\bitrix\modules\calendar\lib\ical\mailinvitation\helper.php on line 26