/gn Feed page has no content but just Error404

Hi,

I am trying to install your plugin.

Unfortunately all pages that it shoul create according to the list in the settings are completly empty.

The Feed I wanted to get into Google News was from this category:
https://www.dein-dlrp.de/disney-parks-magazin/nachrichten-hintergruende/
and should be available at:
https://www.dein-dlrp.de/disney-parks-magazin/nachrichten-hintergruende/feed/gn

But there is nothing there, just the 404 Error-Page.

Do you have any idea how I could solve this problem?

Thank you and best regards

Torsten

The page I need help with: [log in to see the link]