HTML2 generator outputs "undefined" DTOs

Created by: antonio-petricca

Hi, I am using Open API generator plugin 5.1.1.

I instrumented my projects to generate HTML2 documentation.

It works fine for all of them but one which, for the response DTOs, prints an undefined statement as for the attached snapshot:

I opened the browser debug console and I found the following error:

SyntaxError: Error resolving $ref pointer "http://localhost:7001/my-api/help#/components/schemas/NickNameTypeDTO". 
Token "components" does not exist.
    at Function.syntax (help:8110)
    at Pointer.resolve (help:7898)
    at $Ref.resolve (help:7901)
    at $Refs._resolve (help:7904)
    at dereference$Ref (help:7856)
    at help:7856
    at Array.forEach (<anonymous>)
    at crawl (help:7856)
    at help:7856
    at Array.forEach (<anonymous>)

How can I further investigate on the causes of that issue?

Thank you so much!