Error message

Try manually resetting your plugins (no Dashboard access required). If that resolves the issue, reactivate each one individually until you find the cause.

If that does not resolve the issue, access your server via SFTP or FTP, or a file manager in your hosting account’s control panel, navigate to /wp-content/themes/ and rename the directory of your currently active theme. This will force the default theme to activate and hopefully rule-out a theme-specific issue (theme functions can interfere like plugins).

So, it sounds like you don’t have a copy of the default theme installed. 😉

Do you have access to your Dashboard? If so, go to Appearance -> Themes -> Add New, then search for and install the Twenty Sixteen theme. After we’re done with this, always keep it around, as it’s bug-free and very handy for troubleshooting.

Now that you’re in the Dashboard, we can do the less extreme version of above. Try deactivating all plugins. If that resolves the issue, reactivate each one individually until you find the cause.

If that does not resolve the issue, try switching to the Twenty Sixteen theme to rule-out a theme-specific issue (theme functions can interfere like plugins).

If you *don’t* have Dashboard access, then download the Twenty Sixteen theme from https://wordpress.org/themes/twentysixteen/ and upload it to the /wp-content/themes/ directory, then repeat the steps from earlier.

You shouldn’t need to reinstall anything. If you deactivated them by changing the name of the directory, change it back.

Only if you feel like you do. 🙂

I recommend asking at https://wordpress.org/support/plugin/wordfence so the plugin’s developers and support community can help you with this.