direktori virtual tidak terbuat

Kenapa, direktori virtual punya saya nggak otomatis terbuat, kalo kita 
bikin email di postfix admin.

[root@mail postfixadmin]# tail -f /var/log/mail/warnings
Jul 20 14:45:28 mail postfix/cleanup[2953]: warning: 6D78D5AE4E: 
virtual_alias_maps map lookup problem for [email protected]
Jul 20 14:45:28 mail postfix/pickup[2951]: warning: maildrop/44F105AE4C: 
Error writing message file
Jul 20 14:45:28 mail postfix/cleanup[2953]: warning: 6F3A85AE4E: 
virtual_alias_maps map lookup problem for [email protected]
Jul 20 14:45:28 mail postfix/pickup[2951]: warning: maildrop/42F925AE4D: 
Error writing message file
Jul 20 14:46:28 mail postfix/cleanup[2953]: warning: connect to mysql 
server localhost: Can't connect to local MySQL server through socket 
'/var/lib/mysql/mysql.sock' (2)
Jul 20 14:46:28 mail postfix/cleanup[2953]: warning: 74CD45AE4E: 
virtual_alias_maps map lookup problem for [email protected]
Jul 20 14:46:28 mail postfix/pickup[2951]: warning: maildrop/44F105AE4C: 
Error writing message file
Jul 20 14:46:28 mail postfix/cleanup[2957]: warning: connect to mysql 
server localhost: Can't connect to local MySQL server through socket 
'/var/lib/mysql/mysql.sock' (2)
Jul 20 14:46:28 mail postfix/cleanup[2957]: warning: 768005AE4E: 
virtual_alias_maps map lookup problem for [email protected]
Jul 20 14:46:28 mail postfix/pickup[2951]: warning: maildrop/42F925AE4D: 
Error writing message file

Kalo dari log ini, pemahaman saya, postfix tidak bisa akses ke mysql, 
padahal password udah tak samain, isi virtual_alias_maps.cf nya juga 
ngambil dari bawaan postfixadmin.
Please Help...