It looks like you are using three
select_one_from_file questions in group
pt1. AFAIK, from what little documentation I could find, this question type is Kobo-specific and only supported using the Enketo web-browser (ie not the mobile app). But it appears that perhaps this is no longer working/supported (?). If that were thee case then all the question in group
pt1 would be invalid/ignored, causing you to have a group with no (valid) questions - which may be why you are seeing this error as fallout.
At the moment, this feature is only available using XLSForms and the data can only be entered through Enketo and is not supported by ODK or KoBoCollect.
I might suggest just trying to get a single, simple
select_one_from_file working first, just to confirm this question type is still working. Perhaps one of the Kobo core team can comment as to the status of this, @stephanealoo?