سلام دوستان لطفا فوری کمک کنید

وقتی از پنل وب میخوام mysql رو ریستارت کنم این خطا رو میده :

کد:

Waiting for “mysql” to restart ……………………………………………………………………………………………………………………waiting for “mysql” to initialize …………………………………finished.

The service “mysql” failed to start with the message: mysql is not running
/usr/bin/mysqladmin: connect to server at 'localhost' failed
error: 'Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)'
Check that mysqld is running and that the socket: '/var/lib/mysql/mysql.sock' exists!

Startup Log:
     Starting MySQL. ERROR! The server quit without updating PID file (/var/lib/mysql/server_ip_address.pid).

Log Messages:
     141220 13:46:30 mysqld_safe mysqld from pid file /var/lib/mysql/server_ip_address.pid ended
     /usr/sbin/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
     141220 13:46:30 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
     141220 13:44:27 mysqld_safe mysqld from pid file /var/lib/mysql/server_ip_address.pid ended
     /usr/sbin/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
     141220 13:44:27 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
     141220 13:40:30 mysqld_safe mysqld from pid file /var/lib/mysql/server_ip_address.pid ended
     /usr/sbin/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
     141220 13:40:29 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
     141220 13:39:54 mysqld_safe mysqld from pid file /var/lib/mysql/server_ip_address.pid ended
     /usr/sbin/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
     141220 13:39:54 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
     141220 13:39:31 mysqld_safe mysqld from pid file /var/lib/mysql/server_ip_address.pid ended
     /usr/sbin/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
     141220 13:39:31 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
     141220 13:39:17 mysqld_safe mysqld from pid file /var/lib/mysql/server_ip_address.pid ended
     /usr/sbin/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
     141220 13:39:17 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
     141220 13:35:06 mysqld_safe mysqld from pid file /var/lib/mysql/server_ip_address.pid ended
     /usr/sbin/mysqld: Can't find file: './mysql/plugin.frm' (errno: 13)
     141220 13:35:05 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
     141220 13:33:43 mysqld_safe mysqld from pid file /var/lib/mysql/server_ip_address.pid ended

mysql has failed. Please contact your system administrator if the service does not automagically recover.