“A critical error” when I try to edit or create a page

Hi!

I have “Lawyer Zone pro” theme installed and my page is built in SiteOrigin Page Builder, but I can’t edit a homepage or any subpage anymore, I can’t also create any new subpage. When I try to edit a page or create a new one, I get the message “A critical error has occurred on this website”. WordPress is updated to the last version, and all the plugins are up-to-date.

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