---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/90000#article
headline: "90000: Uncaught Flex JavaScript Exception"
url: https://www.twilio.com/docs/api/errors/90000
inLanguage: en
dateModified: 2026-03-11T22:03:37.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 90000: Uncaught Flex JavaScript Exception

Log Level: ERROR

## Description

A JavaScript error has occurred within Flex UI.

### Possible causes

* There may have been an issue initializing Flex
* There may be an uncaught exception within a Flex plugin