Fatal error: Call to undefined method PMA_Config::load() in /usr/share/phpmyadmin/libraries/Config.class.php

 Solution :

Restart apache and mysql both.

If you are using XAMPP - Restart it.

# /opt/lampp/lampp restart

It will restart apache and mysql both.

If you are using apache2 - restart it using

# service apache2 restart

If you are using apache2 - restart it using

# service mysql restart

If you are using httpd - restart it using

# service httpd restart

If you are using mysqld - restart it using

# service mysqld restart