Hello friends, thank you very much for the attention you gave me trying to help me with this problem.
Yesterday I sent an email to support a plugin I'm using, and following the support instructions I solved the problem.
The plugin that was causing this problem is Hide My Wp just by deleting your API modifications the problem has been solved.
The only strange thing about all this is that when I deactivated all the plugins and theme, the error persisted.
But I thank you very much for your support.
I wish you an excellent week.