Can't execute query

SELECT p.*,c.id as cid FROM knowledge_tw as p, knowledge_cate_tw c, knowledge_category_tw as it WHERE (p.id = '76963429' || p.serial_no = '76963429') AND p.id = it.pid AND it.category=c.id AND (p.available='1' or (p.available='0' and p.sdate <= '2018-12-15' AND p.edate >= '2018-12-15')) AND c.available = '1' AND it.category in (������������������������) GROUP by it.pid

MySQL Error: Unknown column '������������������������' in 'where clause'

This script cannot continue, terminating.