mysqladmin error in MySQL Templaet zabbix agent

[nmz]

I'm using zabbix server 2.2 and database and zabbix_agent was installed in other host. When I try to monitor mysql database with zabbix agent I got such as error
mysqladmin: connect to server at 'localhost' failed
error: 'Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock'...

[naveen.s]

I defined template and discovery for my host Using custom parameters . when i define item prototype i am getting an error Cannot create item: item with the same key "sfa.disk_usage[{#SFANAME},40]" already exists. my custom userparameters are

# User parameter conf file
...