Fix 1054 - Unknown column 'p.products_id' in 'on clause' error

Hello I have an error on my site, i fixed the ones in the categories that had the same error, but im still getting this error when i have a subcategory. 1054 - Unknown column 'p.products_id' in 'on clause' select distinct p.products_id, p.products_image, p.products_tax_class_id, [login to view URL] as specstat, s.specials_new_products_price, p.products_price from products p left join specials s on p.products_id = s.products_id, products_to_categories p2c, categories c left join featured f on p.products_id = f.products_id where p.products_id = p2c.products_id and p2c.categories_id = c.categories_id and c.parent_id = '81' and p.products_status = '1' and [login to view URL] = '1' order by rand() DESC limit 12 [TEP STOP] Must have good knowledge of oscommerce and programming. Thanks