---
title: "unknown_function — error code"
description: "Aontu error code unknown_function: class reference — a path names nothing. Introduced in 0.51.0."
source: "https://aontu.dev/errors/unknown_function/"
---

[← every error code](https://aontu.dev/errors)

# `unknown_function`

Class

[`reference`](https://aontu.dev/errors#reference)

Since

`0.51.0`

Kind

fixed code

## What it means

a path names nothing.

## What to do

check the spelling; `aontu get $ --keys` lists what is there

## Where this comes from

[`test/spec/errcodes.tsv`](https://github.com/aontu-lang/aontu/blob/main/test/spec/errcodes.tsv), the shared registry both implementations execute and assert set equality against. The _message text_ is deliberately not reproduced here: the engines are its catalogue, and a copy on this site would be a second source of truth for something already generated once. To read it, run the engine — or see [the skill's error-code guide](https://github.com/aontu-lang/aontu/blob/main/docs/skill/error-codes.md).

This page as data: [`/errors/unknown_function.json`](https://aontu.dev/errors/unknown_function.json)