Help with Database Error

[Cutsizzle]

What exactly is this? it doesn't cause a db error on the forums and I ip searched the IP addresses responsible for this and they are all google crawl spiders. It doesn't do anything on the forums as the forums remain fine, however I wanted to fix it since it sends an error email.

Database error in vBulletin :

mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (11)
/home/chicity/public_html/forum/includes/class_core.php on line 311

MySQL Error :
Error Number :
Request Date : Wednesday, May 12th 2010 @ 04:09:18 PM
Error Date : Wednesday, May 12th 2010 @ 04:09:19 PM
Script : http://chicitysports.com/forum/forumdisplay.php?f=0
Referrer : http://chicitysports.com/forum/bar/600-miley-being-miley.html
IP Address : 65.91.107.23
Username :
Classname : vB_Database
MySQL Version :

[Lynne]

See this page for the causes of this error: http://www.vbulletin.com/docs/html/cantconnect

[Cutsizzle]

thank you