Unexpected KoBoCAT error 400: b’{“detail”:“The name column for the 'hr2sl27' choice list contains these duplicates: '_'. Duplicate names will be impossible to identify in analysis unless a previous value in a cascading select differentiates them. If this is intentional, you can set the allow_choice_duplicates setting to 'yes'. Learn more: XLSForm.org”}’
@riya_1820, this post discussed previously should help you identify syntax issues if any within your form.
You should also be able to identify syntax issues by validating your XLSForm through this online validator.