You can use the bindings tab to display more information about the error on the page. Go to Bindings and click the plus button and choose: WebAssist->eCart->Local checkout response and choose the part of the process when you are getting the failure page. Click OK and those values with distinct error messages will be available to drag and display on the page.
You shouldn't need the eCart object, but you can place a display on the page if you want to display the cart contents and the object will be added automatically.
Did this help? Tips are appreciated...
