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How to display class level validation error in thymeleaf (not field)  RSS feed

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I read this article https://www.baeldung.com/spring-mvc-custom-validator.
And created custom class annotation for multiple fields validation like was written in "9. Custom Class Level Validation".

I wonder how to display class validation error. For field I do:

But I dont know how to bind my validation error with some field or just how to show it in thymeleaf template?
If you know any solution, please reply.

That object with custom annotation @UniqueTranslation:

In debugger I see my error in BindingResult:

In validator I just override isValid() method:

If required (links on github code):
UniqueTranslation annotation
UniqueField annotation
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