Thanks, I did it.
I deleted some plugins not activated and now it’s working. But I reinstalled the site because the host techinicians didn’t know what’s happens with the WP.
The deleted plugins, I never choosed, they appeared in the plugins list.
I thought that the problem was the PHP, Gutemberg editor or the plugins or maybe the new version of WP. I don’t know!!
But now it’s working.
Nicolás
Thanks, I reinstalled the WP. Is not working the editor. Maybe the server where is my site is not working!!!
