[Zope] Simple Z3C.Forms question

[Edu]

This is a simple question, I'm using z3c.form, I have an AddForm and I
created the view with the wrap_form method.

I'm using invariants, the problem is whenever something's wrong I get a
message saying "There were some errors".

I'd like to get the explicit message that the invariant raises...

Thank you for your help!
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