database error at upgrading from 3.7 to 3.8
 

Hello daer friends.
I want to upgrade from 3.7.1 to 3.8.2 , I have done all things well, but when I reach to this section:
Step 5) Upgrade to vBulletin 3.8.0 Alpha 2 Complete! (Step 5 of 5)
I face with this Error:

Quote:
Database error in vBulletin 3.7.1:
Invalid SQL:
SELECT prefix.*, prefixpermission.usergroupid AS restriction
FROM prefix AS prefix
LEFT JOIN prefixpermission AS prefixpermission ON (prefix.prefixid = prefixpermission.prefixid)
ORDER BY prefix.displayorder;
MySQL Error : Illegal mix of collations (latin1_general_ci,IMPLICIT) and (latin1_swedish_ci,IMPLICIT) for operation '='
Error Number : 1267
Request Date : Tuesday, May 26th 2009 @ 04:16:08 AM
Error Date : Tuesday, May 26th 2009 @ 04:16:09 AM
Classname : vB_Database
MySQL Version : 5.0.67-community-log
what should I do ?
thanks.