I told all my customers about my site today ..YAY... but tonight I am in admin in the order total module trying to work out why my first order doesn't add up and now I am receiving the following message:

Fatal error: Call to a member function on a non-object in /home/highigbc/public_html/store/includes/modules/order_total/ot_gv.php on line 29

I have no idea which is line 29 or how to fix the problem. Can anyone please point me in the right direction?

Thanks
Suzanne

web: www.highlandspapercraft.com/store