Fatal Error

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Please help.
I do not know what I did but everytime someone tries to check out on my website they get the error message below.
Fatal error: Call to a member function getAttributeKeyID() on a non-object in /home3/skirtrip/public_html/packages/core_commerce/models/order/model.php on line 517

The only changes I made are:I added stripe as a payment method and deleted the discounts section of my checkout.

alumman71822