How To Fix Hugo Website Error - from config failed to resolve output format headers from site config

Introduction

Sometimes you might encounter the following error on typing hugo server from your local website directory.

Error: from config: failed to resolve output format "headers" from site config

To resolve the error, head over to config/_default/config.yaml and temporily rewrite the following line as follows:

outputs:
  home: [RSS, JSON, WebAppManifest]

Open terminal and from the home directory of the website type the following commands:

hugo mod clean
hugo mod get -u ./...
hugo mod tidy

When the update is complete head over to config/_default/config.yaml and restore the items that were rewritten.

outputs:
  home: [HTML, RSS, JSON, WebAppManifest, headers, redirects]

Now type hugo server from the website home directory and it should successfully start a server.