Unable to register Open Data URL

[geckogecko]

I run the server with: sudo python3 open_data_server.py

Output:

[12/Jan/2022:20:18:55] ENGINE Listening for SIGTERM.
[12/Jan/2022:20:18:55] ENGINE Listening for SIGHUP.
[12/Jan/2022:20:18:55] ENGINE Listening for SIGUSR1.
[12/Jan/2022:20:18:55] ENGINE Bus STARTING
[12/Jan/2022:20:18:55] ENGINE Started monitor thread 'Autoreloader'.
[12/Jan/2022:20:18:55] ENGINE Serving on http://127.0.0.1:7000
[12/Jan/2022:20:18:55] ENGINE Bus STARTED

But when I try to set the Server in the App I receive: Unable to register Open Data URL - Please try again. (Portforwarding is correctly setup on my router)