ref: 2e711a28c71e8667258e5ab824f9b9a71c261b0a
dir: /content/en/functions/errorf.md/
---
title: errorf
linktitle: errorf
description: Log ERROR and fail the build from the templates.
date: 2017-09-30
publishdate: 2017-09-30
lastmod: 2017-09-30
categories: [functions]
menu:
docs:
parent: "functions"
keywords: [strings, log, error]
signature: ["errorf FORMAT INPUT"]
workson: []
hugoversion:
relatedfuncs: [printf]
deprecated: false
aliases: []
---
`errorf` will evaluate a format string, then output the result to the ERROR log (and only once per error message to avoid flooding the log).
This will also cause the build to fail (the `hugo` command will `exit -1`).
```
{{ errorf "Failed to handle page %q" .Path }}
```
Note that `errorf` supports all the formatting verbs of the [fmt](https://golang.org/pkg/fmt/) package.