Contact page works and doesn't work

I made a Page Builder CK contact page, that I insert into several articles.
All worked well until two hours ago.
In the home page, the CK contact module show an error: see Errore.jpg from www.marcofioretti.it/

But the same Page Builder CK page is used in other article, and there it goes on working fine. See Corretto.png from www.marcofioretti.it/blog/28-la-serratur...a-tua-sicurezza.html

I cleaned the browser cache, checked the contact, deleted the page from the article and recalled it again... But nothing changed.
What can I do?

Hi
I will check in the next days if I can simply add an option to give an email instead of linking a contact.
Remind me in few days if I don't come back to you
CEd

So, this is a reminder.
As you can see, if I insert a module in the article it works. If I insert a page it does not.

I have check the ability to use an email simply instead of the contact ID
this is unfortunately not so simple, as I'm based on the com_contact to render the fields

I will continue to look at this problem in the next days