I have setup the ipn and the express + pro module according to the instruction but it seems tat i have some prob when i am doing testing on the payment itself...

for the ipn: I got to the paypal page asking me to key in the amount...

Please provide an amount and click Update Totals.

for the other option: I got an error stating

An error occurred when we tried to contact the payment processor. Please try again, select an alternate payment method, or contact the store owner for assistance. (10401) 10401 Transaction refused because of an invalid argument. See additional error messages for details. - Order total is invalid.

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- I turned on the IPN notification as well pointing to the ipn_handler page...

here is the testing of the site: http://crossingthelimit.com/store

anyone has any idea what is going on???