Error 404 after (bad?) binding

Hi Bravo friends,

I wrote an email to support, but I’m still without answer, so I hope you would helped me here. :)

One of my screen in Bravo Vision gives me error 404 after binding attempt, when I try follow these instructions:

https://docs.bravostudio.app/connect-api/browse-by-backend/xano/xano-build-nested-lists

In my screen I want:

a)  Put objects, which I called Kmen (strain in english) and use horizontal slider. Kmen has his own database (in Xano) and is connected like an array to Mindnodes (which has its own Database too). 

b) In second line in frontend screen I show these Mindnodes, again as a list in horizontal slider.

---) Relationship between Kmens and mindnodes is similar like Regions and Cities in linked example.

My ultimate goal in this frame is: At the beginning user saw only list of Kmens and after he clicks to one of them, in new line (under list of Kmens) there would appear list of mindnodes, which belongs to clicked Kmen. 

I don't know where I did mistake, I checked every binding, Data library and variables many times, maybe something is wrong witch layers and frames in Figma? 

My screen in bravo studio is: 

https://projects.bravostudio.app/apps/01HK8BNSS1E0BB3JM70Y9G7FKS/screens/01HKQMBY7W71XKZ81J2RFAAP20/bindings

In Figma:

https://www.figma.com/file/NOs7JY0Ut5PMp6XV76qAUM/Mindset%2B-final?type=design&node-id=170%3A30333&mode=design&t=vTHyqCy4YuUWUSDd-1

(Frame: Můj strom)

Can you help me? I am trying to solve only error 404 here, but if you helped me with hiding mindnodes and show them after clicking on exact Kmen, I would appreciate too, cause it is next step and I still have no idea how to do it.

Thank you very much

Robert