by Jim » Thu Jan 20, 2011 5:24 pm
What is causing the error? A product with a negative price? A product with a negative weight, A discount/coupon that exceeds the value of the items in the cart. An order with a total of more than $2 billion?
Can you repeat the problem at will or is it a random occurrence? Does it happen on every order? Can you describe the exact steps to reproduce the problem, (URL to product(s) to add to cart, quantity of products added to cart, coupons used, tax rate in affect, etc).
What version of ShopSite are you using? Where is your store hosted? If it is hosted a ShopSite partner have you asked their support staff for assistance?
You gave too few details to try determine what is causing the problem.