hugo/content/en/functions/errorf.md

title	linktitle	description	date	publishdate	lastmod	categories	menu	keywords	signature	workson	hugoversion	relatedfuncs	deprecated	aliases
errorf	errorf	Log ERROR and fail the build from the templates.	2017-09-30	2017-09-30	2017-09-30	functions	docs parent functions	strings log error	errorf FORMAT INPUT			printf	false

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 package.