---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/520033#article
headline: "520033: Unmapped columns skipped"
url: https://www.twilio.com/docs/api/errors/520033
inLanguage: en
dateModified: 2026-04-01T03:32:01.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 520033: Unmapped columns skipped

Log Type: TWILIO

Log Level: WARNING

## Description

The CSV contains extraneous or unmapped columns. Unmapped columns skipped as Traits.

### Possible causes

* The file includes unknown or unused headers due to schema change

### Possible solutions

* Remove extraneous headers before upload
* Refresh mapping definitions with the backend schema