I wish I could help you, but I also have an error in my system that I’m hoping someone can help with. It is a “Fatal error”. I was upgrading WordPress using the automatic button in the backend. The process was taking a long time so I pressed the ‘go back’ button and now have lost access to the backend.
I hope there is someone out there who can provide a step by step as to what to do!
Fatal error: Call to undefined function set_current_screen() in /usr/www/users/nmcf/en/wp-admin/admin.php on line 129
