Mysql error in article manager

[clauska]

1054 - Unknown column 'a.authors_id' in 'on clause'

select count(*) as total from articles a, articles_to_topics a2t left join topics_description td on a2t.topics_id = td.topics_id left join authors au on a.authors_id = au.authors_id, articles_description ad where (a.articles_date_available IS NULL or to_days(a.articles_date_available) <= to_days(now())) and a.articles_id = a2t.articles_id and a.articles_status = '1' and a.articles_id = ad.articles_id and ad.language_id = '4' and td.language_id = '4'

I think that it is a mysql5 problem, but I can not correct it, badly need help.