Paypal Express checkout - Processor error?!?!?!

[soskuthy]

Hi!

I set up pp express check out in zencart 1.3.8a
and when i click checkout and selec express paypal payment module
it gives me this :

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.

[Kim]

If you use the search (in the blue menu bar above), there are more than 20 posts that contain '10401' - You might find your answer in one of those threads.