Article version: Enterprise Server 2.14

This version of GitHub Enterprise will be discontinued on This version of GitHub Enterprise was discontinued on 2019-07-12. No patch releases will be made, even for critical security issues. For better performance, improved security, and new features, upgrade to the latest version of GitHub Enterprise. For help with the upgrade, contact GitHub Enterprise support.

Page build failed: Unknown tag error

If your GitHub Pages code contains an unrecognized Liquid tag, your GitHub Pages site will not build.

If your GitHub Pages site fails to build because of an unrecognized Liquid tag, you'll get an email that looks like this:

Subject: Page build failed

The page build failed with the following error:

The tag `fake_tag` in `index.html` is not a recognized Liquid tag.

You will only receive an email if outbound email support is enabled on your Enterprise instance. For more information, contact your site administrator.

Troubleshooting unrecognized tag errors

Tip: We strongly recommend running Jekyll locally so you can easily debug and fix build errors before pushing to your GitHub Enterprise Server instance. To learn more about troubleshooting options, see "Troubleshooting GitHub Pages builds."

Check plugin output for unrecognized tags

Plugins are a common source of unrecognized tags. Since GitHub Enterprise doesn't support most plugins, a common workaround is to build locally and include the results in the Pages repository. However, sometimes this workaround includes tags that are not in Jekyll's default variables, which the build cannot parse. For a list of supported plugins, see "Adding Jekyll plugins to a GitHub Pages site."

Once you've fixed any tag errors, you will need to commit your changes and push to your GitHub Pages repository again to trigger another build on the server.

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