Hi Stefano,
Thank you for the feedback. It's true that the cytype was not install in PhP 7.4, but we have revert to older version of PHP 7.3, which is installed with ctype but error persit. In fact, now I cannot even create a new newsletter. It always say: Database error. If you were saving a newsletter try a table upgrade from the status panel.
Is this also Ctype issue?