Unable to deploy your form cannot be deployed because it contains errors

https://kobo.humanitarianresponse.info/#/forms/a3J7eQRUevY5JHqkLRCLSm/edit

your form cannot be deployed because it contains errors:

Unexpected KoBoCAT error 400: {“detail”:“ODK Validate Errors:\nGroup has no children! Group: ${group_qc3ig79}. The XML is invalid.\n\n>> Xform is invalid! See above for errors and warnings.\n\nResult: Invalid”}

Hello,
this happens if you have a group without a UI element, for ex. nothing, or hidden, or calculate only in the group.

Here an example:
EmptyGroup01.xlsx (9.9 KB)
You can preview (and save) the form, but deploy gives the error:
image

You get the same error message, if you check your XLSFom with https://opendatakit.org/xlsform/

You have the same problem, if you only put KoBo metadata in a group, see example
EmptyGroup02.xlsx (10.1 KB)

Further hints:
A note, as single item in a group will work without error.

If the begin_group… end_group is not balanced, you get a different error message, even on preview already
image

Kind regards

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