---
title: "Error importing list custom field data types (CFDT)"
slug: "error-importing-list-custom-field-data-types-cfdt"
updated: 2024-09-24T07:41:21Z
published: 2024-09-24T07:41:21Z
canonical: "help.hyperscience.ai/error-importing-list-custom-field-data-types-cfdt"
---

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# Error importing list custom field data types (CFDT)

## Issue

When importing a CSV containing a list of custom field data types, the following error appears: “Import Error: Upload failed. Please ensure the file follows the upload guidelines.”

![ImportErrorUploadFailed.png](https://cdn.us.document360.io/87894cef-4958-4f3f-be6f-b75a78c82548/Images/Documentation/8080683385613.png)

## Affected versions

All versions

## Affected configurations

All configurations

## Cause

This error is usually caused by errors in the CSV file (e.g., wrong columns or missing required values).

## Solution / Workaround

Make sure the CSV file follows the upload guidelines. If you are not sure which line or lines are causing the problem, you can check the detailed error description in the debug console of your browser.

1. Open your browser’s debug console (e.g., if using Chrome, press F12).
2. Click on the **Network** tab.
3. Try to upload the CSV file until you see the error described above.
4. Find the submission request (highlighted in red) called ***parse_list_values_csv*** and click on it.
5. Click **Preview**. The response will contain the error description (e.g., *The .csv file could not be processed - missing required value on row 31.*):

![DebuggingCustomDataTypeCSV.png](https://cdn.us.document360.io/87894cef-4958-4f3f-be6f-b75a78c82548/Images/Documentation/8080730497165.png)If there are multiple lines that violate the upload guidelines, you will need to repeat these steps to troubleshoot the entire file.