---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/21501#article
headline: "21501: Resource not available"
url: https://www.twilio.com/docs/api/errors/21501
inLanguage: en
dateModified: 2026-03-11T18:38:39.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 21501: Resource not available

Log Level: ERROR

## Description

The resource you requested is not (yet) available.

### Possible causes

* Most likely you're fetching a Recording resource that is temporarily performing some post-processing, and will be available momentarily.

### Possible solutions

* Retry the HTTP request again. The Retry-After header will tell you when to retry. Within a couple seconds should be ample.