MySQL error in file: /engine/modules/functions.php at line 1779

Error Number: 1052

The Error returned was:
Column 'comm_num' in order clause is ambiguous

SQL query:

SELECT p.id, p.autor, p.date, p.short_story, CHAR_LENGTH(p.full_story) as full_story, p.xfields, p.title, p.category, p.alt_name, p.comm_num, p.allow_comm, p.fixed, p.tags, e.news_read, e.allow_rate, e.rating, e.vote_num, e.votes, e.view_edit, e.editdate, e.editor, e.reason , u.email, u.name, u.user_id, u.news_num, u.comm_num, u.user_group, u.lastdate, u.reg_date, u.banned, u.allow_mail, u.info, u.signature, u.foto, u.fullname, u.land, u.favorites, u.pm_all, u.pm_unread, u.time_limit, u.xfields as user_xfields FROM dle_post p LEFT JOIN dle_post_extras e ON (p.id=e.news_id) LEFT JOIN dle_users u ON (e.user_id=u.user_id) WHERE p.category IN ('1','2','3','4','5','6','7','8','9','10','11','12','13','14','15','16','17','18','19','21','22','23','24','25','26','27','28','29','30','31','32','33','34','35','36','37','38','39','40','41','42','43','44','45','46','47','48','49','50','51','52','53','54','55','56','57','58','59','60','61','62','63','64','65','66','67') AND approve=1 ORDER BY comm_num DESC LIMIT 0,5