EREAD! info: MySQL Query Error

Time: 2009-11-8 6:04am
Script: /liferss/13

SQL: SELECT A.book_id,A.book_name,A.type_id,A.book_author,A.book_intro,A.up_date FROM business_sh_book_info A WHERE A.type_id in () AND A.status=1 ORDER BY A.up_date DESC LIMIT 0,50
Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') AND A.status=1 ORDER BY A.up_date DESC LIMIT 0,50' at line 1
Errno.: 1064