We see that the problem is with Elementor, but we already talked to their support because we have the license purchased and they told us that it must be something in the Contact Form 7 plugin that conflicts with elementor itself.
We change the theme to default and deactivate all plugins. We were activating plugin by plugin and the error pops up only with Contact form 7 and Elementor plugins.
What can we do about it?
Thank you!