---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/19040#article
headline: "19040: Custom Field provided is not defined"
url: https://www.twilio.com/docs/api/errors/19040
inLanguage: en
dateModified: 2026-03-11T18:38:39.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 19040: Custom Field provided is not defined

Log Type: APPLICATION

Log Level: ERROR

## Description

The custom field provided in the request does not exist

### Possible causes

Request with a custom\_field that is not defined

### Possible solutions

Use custom field definition API to define the custom field first