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This usually shows up when installing the Sage Pay suite for Magento, in this instance it was caused by the Gift certificate module from Unigery.
There is a fix for this problem.
Unirgy_Giftcert_Helper_Payment extends Mage_Payment_Helper_Data
Unirgy_Giftcert_Helper_Payment extends Ebizmarts_SagePaySuite_Helper_Payment_Data
That should solve the sales order error - you will probably have to log out and back in […]
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