A Database Error Occurred

Error Number: 1064

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 ') ) GROUP BY ak.keywordID' at line 9

SELECT k.keywordID FROM cj_article_keywords ak INNER JOIN cj_keywords k ON k.keywordID = ak.keywordID WHERE ak.keywordID in( SELECT distinct keywordID FROM cj_article_keywords WHERE k.keywordID != 19171 AND articleID IN( ) ) GROUP BY ak.keywordID