My b2evolution Version: Not Entered

waltercruz php5: b2evolution error: MySQL error! / Illegal mix of collations (latin1_general_cs,IMPLICIT) and (utf8_general_cs,COERCIBLE) for operation '='(Errno=1267) / Your query: #015 /       SELECT agnt_ID  / FROM evo_useragents#015 /         / WHERE agnt_signature = 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Ministério da Defesa, DF, Brasil.; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)'#015 /           /   AND agnt_type = 'browser' in /srv/blog/inc/_core/model/db/_db.cla

The site is www.alinemenezes.com and is iso8859-1

Not really a big issue, but how can I solve that?