Arun

Already I’m on php 7.4 version

Hey,

This error may be because of some improper function of plugins or a theme.

Solution: I got the same error. Just rename your “plugins” folder in Cpanel to “wp-plugins” and now you will be able to login. Change the theme and access your dashboard. Then again rename the “wp-plugins” folder back to “plugins”. Now try to find out the plugin which is causing this error and make sure that all the plugins are updated.

Hope this works!

404, or 403 HTTP Error.
This issue usually happen when :

There is a .htaccess file who prevent direct access to the WordPress plugins directory.

Your web host uses mod_security to block requests containing URLs (eg. hosts like HostGator, GoDaddy and The Planet).

In any of these two cases, WSL requires this url to be white-listed:

wp-content/plugins/wordpress-social-login/hybridauth/

For more here is the link buddy

• This reply was modified 7 years, 10 months ago by Arun.

Yes me too have faced the same problem.After installation my site is blank white.It triggers a fatal error.Deleted the plugin from cpanel to get my site back.Developers Please give the solution to make use of it because present in WordPress 3.9.1 version its a useless plugin.