Im having the same issue......tried everything.
Updated the Wp-admin and Wp Includes, still nothing, Htaccess, WP-config, ini-php too, still nothing. I am at wit-ends!
I FOUND A SOLUTION: I TRIED TO DEACTIVATE IT AUTOMATICALLY ON THE DASHBOARD, BUT IT DIDN'T SOLVE THE ISSUE, SO I MANUALLY DISABLE THE PLUGINS FOLDER BY RENAMING IT AS THIS LINK STIPULATED IN THE C-PANEL ON THIS WEBSITE, THEN DELETE plugins 1 by 1, what normally cause this issues for me is YEOST, AKISMET AND JETPACK. I deleted them, then reinstall Jetpack. I decided not to use the other plugins, they always give me headache.....