I'm looking for help please. I try to create a listing but when I get down to 'Delivery' I see this message:

Also there's no mention of International Post which I usually see. I've had this for 2 days now and I get the same message on my desktop: Firefox, Chrome & Edge. I tried on my laptop and I get the same. I also saved as a draft but it still loads with this error. So it can't be my browser/cache etc and it's not my device settings. Also it's a standard item (a book). I can choose couriers OK but nothing results in postage costs being shown.
Any help appreciated.