1030 - Got error 28 from storage engine

select p.products_fsk18, p.products_id, p.products_price, p.products_tax_class_id, p.products_image, pd.products_name, p.products_vpe, p.products_vpe_status, p.products_vpe_value, pd.products_short_description FROM orders_products opa, orders_products opb, orders o, products p, products_description pd where opa.products_id = '799' and opa.orders_id = opb.orders_id and opb.products_id != '799' and opb.products_id = p.products_id and opb.orders_id = o.orders_id and p.products_status = '1' and pd.language_id = '3' and opb.products_id = pd.products_id group by p.products_id order by o.date_purchased desc limit 6

[XT SQL Error]