---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/520036#article
headline: "520036: CSV import / upload error"
url: https://www.twilio.com/docs/api/errors/520036
inLanguage: en
dateModified: 2026-04-01T03:32:01.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 520036: CSV import / upload error

Log Type: TWILIO

Log Level: ERROR

## Description

Malformed CSV file, unsupported encoding, or missing headers.

### Possible causes

* Corrupt file, missing expected identifiers and format, or unsupported CSV delimiter

### Possible solutions

* Open the file in a text editor to compare the format to the import spec