how good is your SQL? That error denotes something is wrong with the SQL comment. At first glance and until I get this module installed try this:
select o.orders_id, o.customers_name, o.payment_method, o.date_purchased, o.last_modified, o.currency, o.currency_value, s.orders_status_name, ot.text as order_total from orders o left join orders_total ot on (o.orders_id = ot.orders_id), orders_status s where o.orders_status = s.orders_status_id and s.language_id = '1' and ot.class = 'ot_total' order by limit '0, 20'
I'm hoping to get to this module soon. So I will play catch up then.
Ian