Get one page checkout working on oscommerce

I have oscommerce with the following mods installed

1) Multi Store

2) STS Templates

3) Ultimate SEO

4) Order Editor

5) Manual Order Maker

6) KTG coupon

Everything works fine until i turn OPC on. If KTG Coupon is uninstalled then i get a blank page. If it is installed then i get Fatal error: Call to undefined method stdClass::calculate_discount() in ....../catalog/includes/classes/[url removed, login to view] on line 190

The old OPC works fine but does not allow discounts. I need to get this fixed quickly and fully working with all the modules installed so i can get on with the design of my site

Skills: OSCommerce, PHP

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About the Employer:
( 9 reviews ) Paignton, United Kingdom

Project ID: #571077

Awarded to:


Hi, we can help you. Best Regards,

$30 USD in 1 day
(558 Reviews)

check pm, please

$120 USD in 2 days
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6 freelancers are bidding on average $81 for this job


Let's do it

$30 USD in 2 days
(79 Reviews)

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Hi , We are interested , Please check PMB...

$100 USD in 2 days
(53 Reviews)

dear sir I have gone through your bid and we can fix these issues very [login to view URL] have done various project son oscommerce recent projects we have finished are [login to view URL] [login to view URL] we have gone to you More

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