Error generating preview


I have the following error when I am trying to generate a preview, noting that the form was working fine and now this error appears

“There does not seem to be a allow_choice_duplicates column header defined in your settings sheet. You must have set allow_choice_duplicates setting in your settings sheet to have duplicate choice list names in your choices sheet”

Could any one help me? what i should do to fix it?

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You probably have at least one choice (name column) duplicate in your choices sheet.
More info here:
Best regards


Thank you very much the problem was solved.

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