Joe,
I think you are missing the necessary include files on this page in order to get this result. Here are the includes that should be put at the top of the page:
<?php
require_once("WA_eCart/Adv_CO_Scripts/PP_DirectPayment_PHP.php");
?>
<?php
require_once("WA_eCart/PP_ECO_Scripts/PP_ECO_PHP.php");
?>
If you have the full request and full response code after these includes it should return the values without error, let me know how this works for you.