New here...EPUB validated but also this error?

My epub is allowed to be published but it gave me one “non-critical” error and for my own knowledge I am wondering what this is and how to fix it :

[1 instance(s) similar to Error while parsing file: [element “guide” incomplete; missing required element “reference”]


Welcome to the community, @Dartagnan! Could you share a screenshot of the issue? Are you trying to refer to an issue related to KoboToolbox, or is it something else?

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