---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/40147#article
headline: "40147: Supervise instruction failed: missing or invalid 'contact_uri'"
url: https://www.twilio.com/docs/api/errors/40147
inLanguage: en
dateModified: 2026-04-10T12:20:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 40147: Supervise instruction failed: missing or invalid 'contact\_uri'

Log Type: APPLICATION

Log Level: ERROR

## Description

This error occurs when you issue a Supervise instruction and the Supervisor's Worker attributes do not include a valid `contact_uri`. TaskRouter stores Worker attributes as JSON and needs `contact_uri` to know whom to call.

### Possible causes

* The Supervisor's Worker attributes do not include `contact_uri`.
* The Supervisor's Worker attributes are not valid JSON, so TaskRouter cannot read `contact_uri`.
* The `contact_uri` value is invalid.
* The `contact_uri` value does not point to a valid phone number or client ID for your implementation.

### Possible solutions

* Update the Supervisor's Worker attributes to include a valid `contact_uri`.
* Make sure the Worker attributes are valid JSON before you save them.
* Set `contact_uri` to the phone number or client ID that should receive the Supervise call.
* Fetch the Worker after updating it to confirm the attributes were saved, then retry the Supervise instruction.

#### Additional resources

* [Worker Resource](/docs/taskrouter/api/worker)
* [Task Reservation Resource](/docs/taskrouter/api/reservations)
* [TaskRouter: Skills-based routing for contact centers](/docs/taskrouter)