Reward Points Module for ZC v13x

[hem]

I have customers getting the following error when they try to checkout using their reward points.

Fatal error: Call to undefined function get_order_total() in
/home2/paw10000/public_html/includes/modules/order_total/ot_reward_points.php
on line 55

That function exists in ot_reward_points.php but errors off anyway.

Thanks
Ken

This is using the new version

I think I've got a handle on what's causing it- I'll code up a new version in the morning.