please help...class_core.php error

[محروم.كوم]

hi, i have a database error that shows:

Database error in vBulletin :

mysql_connect() [function.mysql-connect]: Access denied for user 'mysite'@'localhost' (using password: YES)
/home/mysite/public_html/forum/includes/class_core.php on line 311

MySQL Error :

Error Number :
Request Date : Thursday, May 14th 2009 @ 10:06:42 AM
Error Date : Thursday, May 14th 2009 @ 10:06:42 AM
Script : http://www.mysite.com/forum/install/upgrade.php
Referrer : http://209.160.20:2082/frontend/x3/files/selfile.html?dir=%2fhome%2fmysite%2fpublic_html%2f forum%2finstall&file=upgrade.php
IP Address : 58.178.147.103
Username :
Classname : vB_Database
MySQL Version :

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can this be a server error?

everything, files and all look fine. i upgraded then 1 hour later comes these errors.

could it be that the server host needs to upgrade? or?

i uploaded all files twice. i cant pin point the spot.
cheers __DEFINE_LIKE_SHARE__