See if you can still reach the plugins and themes page of the administration.
example.com/wp-admin/plugins.php
example.com/wp-admin/themes.php
First thing to try is disabling plugins and switching to the default theme, since these are the 2 most common causes of WP problems.
Would also help to know your WordPress version and a site URL if possible, please.
Have you tried:
– deactivating all plugins to see if this resolves the problem? If this works, re-activate the plugins one by one until you find the problematic plugin(s).
– switching to the default theme to rule out any theme-related problems?
– resetting the plugins folder by FTP or phpMyAdmin? Sometimes, an apparently inactive plugin can still cause problems.
– re-uploading the wp-admin and wp-includes folders from a fresh download of WordPress?
