ERROR 1111 (HY000): Invalid use of group function MYSQL

I want show the result

SELECT GolDarah, count(GolDarah) JmlPasien
FROM tblPasien
WHERE monthname(TglLahir) IN ('July','August','September','October','November','December') AND count(GolDarah) JmlPasien = 2
GROUP BY GolDarah
ORDER BY GolDarah;

I Want show the result, but error.
ERROR 1111 (HY000): Invalid use of group function

>Solution :

You should to use HAVING statement like:

    SELECT GolDarah, count(GolDarah) JmlPasien
    FROM tblPasien
    WHERE monthname(TglLahir) IN ('July','August','September','October','November','December') 
    GROUP BY GolDarah
    HAVING count(GolDarah) = 2
    ORDER BY GolDarah;

also WHERE statement can be more effective like:

 WHERE month(TglLahir) > 5