Error: argument of the type 'NoneType' is not iterable

Please help me resolve this error.
i am encountering this error upon previewing the form. the form was generated as xlsform and got uploaded successfully.

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Hi this is most likely related to an ongoing bug KoBo is working to resolve - https://github.com/kobotoolbox/kpi/issues/2175

It’s most likely caused by an unlabeled language column.