---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/50540#article
headline: "50540: Content variable key is too long"
url: https://www.twilio.com/docs/api/errors/50540
inLanguage: en
dateModified: 2026-03-11T20:43:38.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 50540: Content variable key is too long

Log Type: TWILIO

Log Level: ERROR

## Description

Length of key in message content variables is restricted to 16 characters.

### Possible causes

One or many keys in key-value pairs of message content variables are hitting limit of allowed 16 characters.

### Possible solutions

Reduce the length of key characters to maximum 16 in message content variables.