---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/40149#article
headline: "40149: Failed to issue Conference instruction due to missing ‘conference_sid’"
url: https://www.twilio.com/docs/api/errors/40149
inLanguage: en
dateModified: 2026-03-11T20:01:16.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 40149: Failed to issue Conference instruction due to missing ‘conference\_sid’

Log Type: APPLICATION

Log Level: ERROR

## Description

The conference instruction issued as a result of the transfer can only be issued on a task which has a `conference_sid` in its attributes.

### Possible causes

* The Conference instruction was issued on the wrong Task.
* The Task attributes were modified and no longer contain the `conference_sid` property.

### Possible solutions

* Confirm the Conference instruction is issued on the correct voice Task.
* Ensure that the `conference_sid` is present in the Task's attributes.