I have been receiving this error for a form I am building on the platform (no csv/xls uploaded). I am not sure which column or question this error message is reffering to in my form.
The name column for the ‘ox7sa54’ 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.
Welcome to the community, @gahq! Maybe this post discussed previously should help you understand your issue:
Under the choices sheet Press CRTL+F
Then paste ox7sa54
You should now see the duplicate names. Fix it and you should be able to solve your issue. As a further check, you could also validate your xlsform through this online validator to see if there are any other syntax issues present within your xlsform.
@gahq, this is something strange that should not happen (in a form builder). But thank you for bringing this to the community. Maybe our community could chime in if they have faced this at their end too.