CalDAV - add attendee

If im added “attendee” from addressbook into event i get this error: http://screencast.com/t/Fzu5MlQz4H
In “unread” is email with info about this event, but “To” is empty :frowning:

Hello,
and when you open the event is the attendee still there? Could you please send a source of the event? You can view the event’s source by right-clicking it and selecting Show as iCalendar.

Regards,