Error desgining a form

1. What is the problem? Be very detailed.
As attached below and getting this error and don't know what it means
**2. What app or server are you using and on what device and operating system? Include version numbers.**and using windows 10

3. What you have you tried to fix the problem? have tried to rewrite the group and still see the error

4. What steps can we take to reproduce the problem?

5. Anything else we should know or have? If you have a test form or screenshots or logs, attach below.
snap

Hi @Jona_Mutaawe
welcome to the forum! Please introduce yourself here!

Probably you have an empty group? Am I right? Why do you need that?