Hi, tks for your reply…

As I said earlier, I’ve disabled all plugins, but the error remains the same. And I have already installed the plugins that I use on my site.

What I found strange is that the same mistakes occur on the site of your theme. What seems to me to be something related to the theme, not third party plugins or installation of a plugin as mentioned.

https://demo.xtemos.com/basel/

Tks,

Lucas.