Invalid entity supplied: Mage_Sales_Model_Mysql4_Order_Address Object

Hi dear friend, I got some emails about "Payment transaction failed."

Followed is some codes:
Reason
Invalid entity supplied: Mage_Sales_Model_Mysql4_Order_Address Object ( [_eventPrefixrotected] => sales_order_address_resource [_gridrotected] => [_useIsObjectNewrotected] => 1 [_useIncrementIdrotected] => [_entityTypeForIncrementIdrotected] => [_virtualGridColumnsrotected] => [_gridColumnsrotected] => [_eventObjectrotected] => resource [_resourcesrotected] => Mage_Core_Model_Resource Object ( [_connectionTypesrotected] => Array ( [pdo_mysql] => Mage_Core_Model_Resource_Type_Db_Pdo_Mysql Object ( [_namerotected] => [_entityClassrotected] => Mage_Core_Model_Resource_Entity_Table ) ) [_connectionsrotected] => Array ….

I think it maybe order address problem but I can’t sure and hope you could help us to solve this problem.

The followed is the problem order address:
Shipping Address:
tra 123
123
234
234, 23
Vietnam
T: 234

Shipping Method:
Free Shipping

Payment Method:
Hera Wigs Store PayPal Website Payments Standard

Please help us, thanks!