Itoris CustomerRewards
Open app/code/local/TM/FireCheckout/Model/Quote/Address.php
and find following line:
class TM_FireCheckout_Model_Quote_Address extends Mage_Sales_Model_Quote_Address
Replace it with:
class TM_FireCheckout_Model_Quote_Address extends Itoris_CustomerRewards_Model_Rewrite_Sales_Quote_Address
// Mage_Sales_Model_Quote_Address
Save the file and disable compilation mode, if needed.