why this error?

[Kiran-E-Sehar]

why this happened ??

Unexpected Text:

<?xml version="1.0" encoding="windows-1252"?>
<?xml version="1.0" encoding="windows-1252"?>
<errors>
<error><![CDATA[<p>Database Error</p>]]></error>
<error_html><![CDATA[<p>Database error in vBulletin </p>
<p>Invalid SQL:

SELECT notice.noticeid, notice.persistent, notice.dismissible,
noticecriteria.criteriaid, noticecriteria.condition1,
noticecriteria.condition2, noticecriteria.condition3
FROM vbulletin_notice AS notice
LEFT JOIN vbulletin_noticecriteria AS noticecriteria USING(noticeid)
WHERE notice.active = 1
ORDER BY notice.displayorder, notice.title;<p>
<p>
<strong>MySQL Error</strong> : SELECT command denied to user 'admin_sam'@'boscgi3006.eigbox.net' for table 'vbulletin_notice'<br />
<strong>Error Number</strong> : 1142<br />
<strong>Request Date</strong> : Monday, May 14th 2012 @ 02:12:22 PM<br />
<strong>Error Date</strong> : Monday, May 14th 2012 @ 02:12:23 PM<br />
<strong>Script</strong> : http://forum.kiran-e-sehar.com/install/install.php<br />
<strong>Referrer</strong> : http://forum.kiran-e-sehar.com/install/install.php<br />
<strong>Classname</strong> : vB_Database<br />
<strong>MySQL Version</strong> : 5.0.91-log<br />
</p>]]></error_html>
</errors>