Forum Database Error when building sitemap
 

I receive a database error when manually building a sitemap

Code:
Database error in vBulletin 4.0.2:

Invalid SQL:
DELETE FROM vb4_adminutil WHERE title = 'sitemapsession';

MySQL Error : MySQL server has gone away
Error Number : 2006
Request Date : Monday, March 1st 2010 @ 04:02:34 PM
Error Date : Monday, March 1st 2010 @ 04:03:22 PM
Script : http://*****.com/admincp/sitemap.php?do=dobuildsitemap
Referrer : http://******.com/admincp/sitemap.php?do=buildsitemap
IP Address : ******
Username : ****
Classname : vB_Database_MySQLi
MySQL Version :