The ArcGIS Survey123 web app fails to access a CSV file, and returns an error message, "FormLogicError: instance "CSV_NAME" does not exist in model," or fails to pull the data from the CSV file, when the pulldata functions in the survey start with 'once(pulldata...)'.

Solution de contournement

The pulldata() function fails and returns the error when it is nested in another function such as once() and concat(). As a workaround, split up the nested pulldata() function into separate calculations in separate questions and then use those questions in the once() or concat() function.

Other ways of using the workaround are:

• Add a question with the pulldata() function without once() for ArcGIS Survey123 to recognize the CSV file. It can be a hidden question or with a null field type.
• If there is a select_one question tied to the survey (same data as the CSV file used in the pulldata() functions), use 'select_one_from_file' instead of 'select_one', and use the same CSV file instead of the choice list, which requires adding the name and label columns to the CSV file, to enable the ArcGIS Survey123 web app to load the CSV file when the form is launched.

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