Unexpected error occurred...

SQL Error! Unknown column 'p.main_category_id' in 'field list' Query: SELECT p.main_category_id AS categories_id FROM products p, products_to_categories p2c, categories c WHERE p.products_id = '522' AND p.products_status = '1' AND p.products_id = p2c.products_id AND c.categories_id= p2c.categories_id AND p2c.categories_id != 0 AND c.categories_status=1 LIMIT 1