Blanks page loads after clicking Confirm Order using CyberSource addon module

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Hi, Please help me.
I had same issue for "Blanks page loads after clicking Continue checkout".
I use zencart v1.39h and put a third party addon - cybersource payment gateaway. I understand zencart team not responsible for this.
I try to figure this out for 3 days already,I am exactly follow the addon updater's implement guide line, it just come out the blank page at 2nd step of checkout process when is input mistake. cybersource support team said there is no problem for the setting in their site.
I got blank page after billing information input, and click "Continue checkout", the error message shows on the browser " as :
//gemstone.org/shop/index.php?main_page=checkout_payment&payment_error=cs&error=The+credit+card+numb er+starting+with++was+not+entered+correctly%2C+or+we+do+not+accept+that+kind+of+ card.+Please+try+again+or+use+another+credit+card.&cc_owner=&card_expirationMont h=01&card_expirationYear=10.

with blank page come out!

can anyone help,
you can test at my test account:
user email : ichiu#live.com(# replace with @)
Password : testtest
and you can start from : http://gemstone.org/shop/index.php?m...e=products_all

thanks!