---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/420021#article
headline: "420021: Invalid knowledge base request"
url: https://www.twilio.com/docs/api/errors/420021
inLanguage: en
dateModified: 2026-07-29T18:16:50.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 420021: Invalid knowledge base request

Log Type: TWILIO

Log Level: ERROR

## Description

The request payload does not conform to the API schema.

### Possible causes

* A required field is missing.
* A field value is out of range or malformed.

### Possible solutions

* Compare your payload with the API reference, and update any invalid or missing fields listed in the error response.