In my website I have:
Just one country Portugal and allowed to all zip code... ( I just send to portugal)
I not have this error.
My error is:
I have 2 shipping method:
Free and Pay
If I select one, the selection dont work, dont save, the recalculate of the price work but if I make the order I choose free appear the pay method...
Dont save correcly the method of shipping... you know the solution?
BUT
You have the shipping method active? like free, internacional etc? Is enabled? If is not, show this message.