[Mediawiki-l] error 1271: Illegal mix of collations for operation ' IN '

[WikiSysop]

Could someone explain how to fix this error? I'm starting to see this on 
my mediawiki site. As an example :

 From http://asianmediawiki.com/SP is you click on any of the cast 
member pages it produces this error message:


  Database error

A database query syntax error has occurred. This may indicate a bug in 
the software. The last attempted database query was:

    (SQL query hidden)

from within function "Parser::replaceLinkHolders". MySQL returned error 
"1271: Illegal mix of collations for operation ' IN ' 
(asianmediawiki1.asianmediawiki.dreamhosters.com)".

Except for person "Taro Omiya".

Anybody could provide clues on this problems? Thanks