Why do I get an error when opening the receipt template - "Could not resolve the entity from <apex:outputField> value binding ''. <apex:outputField> can only be used with SObjects, or objects that are Visualforce field component resolvable."
If you get an error message similar to the one below then then it is not a real error to be concerned with. It will not occur when being used, or when the "Send Test and Verify" is used.
You can remove the error display by pressing the "Send Test and Verify" button on the template and selecting a Contact and Payment Txn record.