The recipient email is empty. Please fill it in the Page Builder CK contact form

Hi.
The error message in the subject appears on the page of the website.
Nevertheless, the contact module works well and the message gets delivered correctly. Obviously, in the Contact → Email box in the form the recipient address is present.
What can I do?

Hi
is it a conact module that you have duplicated from another one ? Please try to remove the contact addon and put a new one in place, then check if it works
CEd

1. Yes: I used a duplicated module.
2. I deleted the duplicated module and built a brand new one.
3. The error message is still present.

Please, note that the original module is still used (and working well) within my website, in the contact page.
This new contact module has to be placed on a different page.
Is there anything I can do to fix the problem?

ok then please contact me with an admin and FTP access, so that I can check where is the problem

I realised that there is at least one other problem with the PageBuilder CK modules. I don't know if they are connected.
But I'll check, report the details and give you the credentials.

I've just sent an email "Problems and credentials".
Thank you for your support.