Error message in ordering

-- url of the page with the problem -- : paulagottlieb.com/store/cards-landscape
-- HikaShop version -- : 2.3.1 Starter
-- Joomla version -- : 2.5.22
-- PHP version -- : 2.5.4
-- Browser(s) name and version -- : Chrome latest
-- Error-message(debug-mod must be tuned on) -- : image attached

I get an error message just before I get forwarded to the PayPal page after which everything goes well. The error message goes by too fast for me to copy it. But it resembles the attached screen shot except the error is on line 341 and then it redirects to paypal. I think you can replicate the problem by placing an order; just don't complete the purchase when you get to the paypal page.

Thanks,

Luciano

That was it. Thanks.

Mark