Error, connection does not exist or is not published

I use ChronoConnectivity6 with Joomla.
Joomla: 3.9.14
I created in the connections manager a basic listing, using your FAQ from 23 january 2017. If I press //Display/Open in the list of the connection manager, it works fine. But on the frontend I get the following error message:
Error, connection does not exist or is not published
Please help

Hi Frank,
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What is the URL you see in the front-end? It may be that is causing the problem.
​
Bob

Hi Bob,
you can access the page from this page: https://maulbeer.eu/ It is on the left top: Main Menu/Ergebnis
The link is: https://maulbeer.eu/index.php/ergebnis
​
Frank

Hi Frank,
​
Thank you. What is the name of the listing? And how do you have it inserted in the article?
​
Bob

Hi Bob,
the name of the list is "lan-party-ergebnisse" I did not create an article. I created a Menu Title.[file=12506]joomlaMenue.PNG[/file]
Frank

Is the connection published and public?

Yes. It is, see attached screen.[file=12507]PublicPublished.PNG[/file]