---
"@context": https://schema.org
"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/81018#article
headline: "81018: Template evaluation error in Studio widget"
url: https://www.twilio.com/docs/api/errors/81018
inLanguage: en
dateModified: 2026-03-11T22:03:37.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 81018: Template evaluation error in Studio widget

Log Type: APPLICATION

Log Level: WARNING

## Description

An error occurred when Studio tried to evaluate your template syntax.

### Possible causes

* The syntax used in your widget caused an error
* An array index referenced in your widget didn't exist at execution time
* Your Liquid curly braces are mismatched
* You used a `+` character in your template
* You have improperly assigned a variable
* You used a non-ASCII character in a variable name
* A tag or filter used in your template does not exist

### Possible solutions

* Check the syntax used in your widget (See Liquid docs [here](/docs/studio/user-guide/liquid-template-language))
* Verify the runtime data of your flow execution by checking the Flow Data and inspecting any variables you may have referenced
* Verify that your Liquid curly braces are matched
* Verify that all tags and filters used in your template are correct (The list of available filters is [here](/docs/studio/user-guide/liquid-template-language#standard-filters))
* Use only ASCII characters in variable names