I have a problem with the links in the calendar. As admin I can click on the links on https://www.heilpraktiker-foren.de/calendar/month/2022/1/ and they show to the thread of the event. As other user der came a error message:
Oops! We ran into some problems.
The requested page could not be...
Where is what? You have to install the Responsive Design and add a Custom Banner Code like this:
<a href="http://www.domain.com" target="_blank"><img src="http://www.domain.com/ad.gif" alt="" /></a></div>