vBulletin Database Error!

[محروم.كوم]

I got this email. Everything is fine but what does this mean?
The "xxx's" did have something there but someone once told me to "XXX" them out for security reasons. Don't know if that's bordering on paranoia??

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Subject: vBulletin Database Error!

Database error in vBulletin :

mysql_connect() [function.mysql-connect]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
/home/xxxxxxxxxx/public_html/dumontnjforum.com/forums/includes/class_core.php on line 311

MySQL Error :
Error Number :
Request Date : Friday, July 10th 2009 @ 12:07:09 PM
Error Date : Friday, July 10th 2009 @ 12:07:10 PM
Script : http://www.dumontnjforum.com/forums/showthread.php?p=14
Referrer :
IP Address : xx.xxx.xx.xxx

Username :
Classname : vB_Database
MySQL Version :

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Thanks!! __DEFINE_LIKE_SHARE__