I am testing the Paypal Express Checkout and am encountering the following problems:

1) On the Shopping Cart contents page, the "Checkout with Paypal" button does not work. I click on it and get directed to an error page with the title "The page cannot be displayed". The URL of the page is http://s199437510.onlinehome.us/dads...er.php?type=ec

2) If I go through the standard order/payment steps and select "Checkout with Paypal under the Payment Method, I get the same error page when I do the final click to confirm order with this URL: http://s199437510.onlinehome.us/dads...=1&stage=final

I have the Paypal IPN installed and it is working fine. I have successfully ordered and processed the payments using the direct Credit Card option. But, the Paypal Express option is tied up.

Here is the server information from my ZenCart:
Server Host: infong491 (74.208.16.32) Database Host: db671.perfora.net (172.19.136.32) Server OS: Linux 2.6.16.33-20070131a-areca-filemon-3ware-e1000 Database: MySQL 4.0.27-standard-log Server Date: 05/30/2007 17:36:06 Database Date: 05/30/2007 17:36:06 Server Up Time:
PHP Version: 4.4.7 (Zend: 1.3.0)
HTTP Server: Apache/1.3.33 (Unix)

Help!