What's the problem with shipping price? can not sell anything...
 

Once you get a weird message about empty shipping price it means that:

the automatic calculation of the shipping price to the country/continent the customer is from can not be done and you should go to you ORDER and EDIT the order directly to put any number including 0$.

caution: most of customers prefer to know how much they are paying for the shipping/ensurance/etc. so we would recommend to split the price into subprices.