"No Results" Yellow errorbar

From semantic-mediawiki.org

Thank you very much, I already thought it was something I did wrong or forgot :). I think I've got the hang of it. However, when I look at the Demo eventcalendar and I hover over an event it only shows the description in the mouse-over. I can't seem to get this same information correctly displayed in mine.

When I create Property:Has_event with datatype text (or string) the event completely disappears from the calendar.

Any thoughts?

16:58, 23 December 2014