---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/54150#article
headline: "54150: List not found"
url: https://www.twilio.com/docs/api/errors/54150
inLanguage: en
dateModified: 2026-06-08T11:29:20.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 54150: List not found

Log Level: ERROR

## Description

This error appears when Twilio cannot find the Sync List you requested in the specified Sync Service. You can address a Sync List by its `sid` or `unique_name`, and a List can stop existing if it was deleted or expired because of TTL.

### Possible causes

* The `sid` or `unique_name` in your request does not match an existing Sync List.
* The `ServiceSid` in your request points to a different Sync Service than the one that owns the List. Fetch, update, and delete operations all scope the List under a specific `ServiceSid`.
* The Sync List was deleted. Deleting a List permanently removes it and all of its items.
* The Sync List expired because you set `ttl` or `collectionTtl` on the List. Expired Sync objects disappear from the SDKs and the REST API.

### Possible solutions

* Verify the identifier you send for the List. Use the exact `sid` or `unique_name` assigned to that List.
* Verify the `ServiceSid` in the request. Use the same Sync Service that contains the List you want to fetch, update, or delete.
* Read the Lists in the target Sync Service before retrying so you can confirm that the List still exists and copy the correct identifier.
* If you use TTL, review the List's `ttl` or `collectionTtl` value. Increase it, remove it, or create the List again if it has already expired or was deleted.

#### Additional resources

* [List Resource](/docs/sync/api/list-resource)
* [Sync Objects Time-To-Live (TTL)](/docs/sync/objects-ttl)
* [Sync overview](/docs/sync)