A Database Error has Occured : 1052: Column 'category_list' in where clause is ambiguous

Query = select f.baseurl, f.name as 'fname', DATE_FORMAT(fi.thedate,'%W, %M %d, %Y') as 'groupedby', fi.* from news_feed f, news_feeditem fi where fi.feed_id=f.id AND FIND_IN_SET(26, category_list) /*AND ( WEEK(FROM_UNIXTIME(-324000))=WEEK(fi.thedate) AND YEAR(FROM_UNIXTIME(-324000))=YEAR(fi.thedate) ) */ ORDER BY thedate desc LIMIT 12925, 25 /* EXEC SQL 2 [] */