Totals do not match order amounts

Hello,

I am having an issue with my OpenCart (Ver 1.5.6)

Using guest checkout with paypal as selected method I get the error "The totals of the cart item amounts do not match order amounts."

I only get this error when trying to checkout with more than five of the same item.

I've also tried

http://forum.opencart.com/viewtopic.php ... 38#p456038

It appears the problem is trying to checkout with anything over $999.99

VQmod for fix it!

Paypal express checkout - I have replaced the codes in catalog/model/payment/pp_express.php file. but, still I got the same error totals of the cart item amounts do not match order amounts . see this link http://forum.opencart.com/viewtopic.php?f=10&t=126442