I’m setting up a multilingual site that needs to be up and running now and I stupidly upgraded to 3.1 without thinking, which is incompatible with qTranslate.
I tried to downgrade by overwriting wp-admin, wp-includes and root files (minus config) with previous files and then refreshed website and upgraded database. Website appears okay but it’s giving me this error when I try to log into the backend:
Fatal error: Call to undefined function set_current_screen() in /home/content/html/wp-admin/admin.php on line 129
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