eBay Displays "The seller has not specified a shipping method to XXX"

When we are accessing the postage after the product has been successfully listed, sometimes eBay shows “the seller has not specified a shipping method to (a country)” on listing page above the postage info.

Most likely, the international shipping costs haven’t been set up yet. If you see this on your listing, please revise the amount of international postage and synchronize changes to eBay. Check your results and adjust the international postage again if needed.