when I want to preview my form it shows me this message:
“argument of type ‘NoneType’ is not iterable”
You will be seeing the message argument of type ‘NoneType’ is not iterable when there is a mismatch between the label columns in the survey and choices tab. In some cases, you may also see the message if there are unlabeled language columns (
hint) in the form.
For more, please go through the following page: