MySQL error .. is it common?

[محروم.كوم]

I get alot of such msg* is it common??
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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/ on line 311

MySQL Error :
Error Number :
Request Date : Wednesday* November 11th 2009 @ 11:07:52 PM

Error Date : Wednesday* November 11th 2009 @ 11:07:52 PM
Script :
Referrer :
IP Address : 202.42.255.254
Username :
Classname : vB_Database
MySQL Version : __DEFINE_LIKE_SHARE__