---
page_type: error
code: 40154
message: "40154: Invalid Known Worker information"
level: ERROR
product: TaskRouter
---

## 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