database error :S

[محروم.كوم]

I start to get this error a lot of times after upgrade 3.8.1 to 3.8.2:

What can i do?

The problem is in the file or in my database...?? Someone can help me?
mysql_connect() [function.mysql-connect]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
/home/******/*******/foros/includes/class_core.php on line 311

MySQL Error :
Error Number :
Request Date : Tuesday, June 2nd 2009 @ 10:41:57 PM
Error Date : Tuesday, June 2nd 2009 @ 10:41:57 PM
Script : http://xtreme-gamez.com.ar/foros/showthread.php?t=3187
Referrer : http://xtreme-gamez.com.ar/foros/forumdisplay.php?f=50

IP Address : ****************
Username :
Classname : vB_Database
MySQL Version : __DEFINE_LIKE_SHARE__