---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/420015#article
headline: "420015: Knowledge search validation failed"
url: https://www.twilio.com/docs/api/errors/420015
inLanguage: en
dateModified: 2026-04-01T17:30:49.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 420015: Knowledge search validation failed

Log Type: TWILIO

Log Level: ERROR

## Description

The search request contains invalid or malformed data and was rejected.

### Possible causes

* Invalid JSON format in request body
* Invalid knowledge ID format in search filters
* Malformed query parameters

### Possible solutions

* Verify the request body is valid JSON
* Check that knowledge IDs follow the correct format (know\_knowledge\_\*)
* Review the API error details for specific validation failures