[IRANCITY]

i install ibProArcade
but when i click on topic i see data base err
Database error in vBulletin 3.8.5:

Invalid SQL:

SELECT t.champion, u.userid FROM tournaments AS t
LEFT JOIN user AS u ON (t.champion = u.username)
WHERE champion<>'';

MySQL Error : Illegal mix of collations (latin1_general_ci,IMPLICIT) and (latin1_swedish_ci,IMPLICIT) for operation '='
Error Number : 1267
Request Date : Friday, March 12th 2010 @ 09:15:10 PM
Error Date : Friday, March 12th 2010 @ 09:15:10 PM
Script : http://forum.iecloob.com/showthread.php?t=23722
Referrer :
IP Address : 78.39.40.253
Username : Mr . Saeed
Classname : vB_Database
MySQL Version : 5.0.51a-community-log

what am i doing ?