What is the mistake?
It is written in the error message: There is a group which has no (visible) data elements. The name of this group is given in the message.
Do you check your forms during development with the online validator?
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@svar_2019, this is what is happening in your form as pointed by @wroos. FYI …
The group should have at least one question in it. It could be something like this …
