[CudaFly]

hi
tried to load and when I click on the experience tab get the following database error. Any ideas?
Database error in vBulletin 4.0.6:

Invalid SQL:
SELECT
COUNT(*) AS cnt_ach,
i.achievementid,
a.title,
a.description,
a.imagebig
FROM xperience_achievements_issues AS i
INNER JOIN xperience_achievements AS a ON a.achievementid=i.achievementid
GROUP BY achievementid
ORDER BY COUNT(*) DESC
LIMIT 1;

MySQL Error : Invalid use of group function
Error Number : 1111
Request Date : Wednesday, September 15th 2010 @ 10:46:40 PM
Error Date : Wednesday, September 15th 2010 @ 10:46:40 PM
Script : http://www.cudafly.co.uk/forum/xperience.php
Referrer : http://www.cudafly.co.uk/forum/forum.php
IP Address : 86.10.191.166
Username : CudaFly
Classname : vB_Database
MySQL Version : 4.1.20-community-nt

Thanks

Steve