Error while connecting to MySQL: Access denied for user 'root'@'localhost' to database 'mysql'.
Error from MySQL query: Can't call method "do" on an undefined value at /usr/local/cpanel/Cpanel/Mysql.pm line 1195.

Çözüm=
SSH dan aşağıdaki komut satırlarnı uygulayın

/etc/init.d/mysql stop
mysqld_safe --skip-grant-tables &
mysql
\u mysql
UPDATE `mysql`.`user` SET `Select_priv` = 'Y', `Insert_priv` = 'Y', `Update_priv` = 'Y', `Delete_priv` = 'Y', `Create_priv` = 'Y', `Drop_priv` = 'Y', `Reload_priv` = 'Y', `Shutdown_priv` = 'Y', `Process_priv` = 'Y', `File_priv` = 'Y', `Grant_priv` = 'Y', `References_priv` = 'Y', `Index_priv` = 'Y', `Alter_priv` = 'Y', `Show_db_priv` = 'Y', `Super_priv` = 'Y', `Create_tmp_table_priv` = 'Y', `Lock_tables_priv` = 'Y', `Execute_priv` = 'Y', `Repl_slave_priv` = 'Y', `Repl_client_priv` = 'Y', `Create_view_priv` = 'Y', `Show_view_priv` = 'Y', `Create_routine_priv` = 'Y', `Alter_routine_priv` = 'Y', `Create_user_priv` = 'Y', `Event_priv` = 'Y', `Trigger_priv` = 'Y' WHERE `user`.`Host` = 'localhost' AND `user`.`User` = 'root';
/etc/init.d/mysql restart