---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/40154#article
headline: "40154: Invalid Known Worker information"
url: https://www.twilio.com/docs/api/errors/40154
inLanguage: en
dateModified: 2026-03-11T20:01:16.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 40154: Invalid Known Worker information

Log Type: APPLICATION

Log Level: ERROR

## Description

Worker information is missing or not valid.

### Possible causes

The Task does not have a field that holds the Known Worker information, the Worker information specified is invalid, or the specified Worker does not exist in TaskRouter.

### Possible solutions

Ensure the Task field referenced in the Workflow definition is provided in the Task's attributes. If Worker information is provided, make sure that the Worker does exist in TaskRouter. Find out more about the Known Worker Routing feature here: https://www.twilio.com/docs/taskrouter/workflow-configuration/known-agent-routing