website/_includes/templates/glossary/_error.md

ERROR: You must define a {{ include.missing_block }} field

{: style="color:red" }

The glossary template requires that you provide text that {{ include.purpose }}.

To get rid of this message and take advantage of this template, define the {{ include.missing_block }} field for the {{ include.term }} glossary term and populate it with content.

See _data/glossary/_example.yml for reference.