SS Blog Module Error Message

[17-Mar-2016 16:11:00] Error at framework/model/connect/DBConnector.php line 55: Uncaught SS_DatabaseException: Couldn't run query:

SELECT DISTINCT "PublishDate" IS NULL AS "_SortColumn0", "SiteTree"."ClassName", "SiteTree"."LastEdited", "SiteTree"."Created", "SiteTree"."URLSegment", "SiteTree"."Title", "SiteTree"."MenuTitle", "SiteTree"."Content", "SiteTree"."MetaDescription", "SiteTree"."ExtraMeta", "SiteTree"."ShowInMenus", "SiteTree"."ShowInSearch", "SiteTree"."Sort", "SiteTree"."HasBrokenFile", "SiteTree"."HasBrokenLink", "SiteTree"."ReportClass", "SiteTree"."CanViewType", "SiteTree"."CanEditType", "SiteTree"."Priority", "SiteTree"."MetaTitle", "SiteTree"."Version", "SiteTree"."ParentID", "BlogPost"."PublishDate", "BlogPost"."AuthorNames", "BlogPost"."Summary", "BlogPost"."InheritSideBar", "BlogPost"."SideBarID", "SiteTree"."ID",
			CASE WHEN "SiteTree"."ClassName" IS NOT NULL THEN "SiteTree"."ClassName"
			ELSE 'SiteTree' END AS "RecordClassName"

FROM "SiteTree"
LEFT JOIN "BlogPost" ON "BlogPost"."ID" = "SiteTree"."ID"

WHERE ("SiteTree"."ParentID" = ?)
 AND ("SiteTree"."ClassName" IN (?, ?))

GROUP BY DATE_FORMAT("PublishDate", '%Y')

ORDER BY "_SortColumn0" DESC, "PublishDate" DESC

LIMIT 5

42000-1055: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'kh.BlogPost.PublishDate' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by (http://<my_website>/home/blog/new-blog-post/?stage=Stage)