Help needed - On clicking on 'list it for free' button at the end of creating a listing, the system flashes a red message across the top of the screen, then immediately re-displays the 'complete your listing page' I have just tried to 'list it for free'.
It happens so fast that I cannot read what the red message says, and there no highlighted fields to indicate where the problem is.
I have tried several times today, earlier this morning and again now.
I have been listing items for sale for quite a long time, and can see nothing wrong with my failing listing, nor anything missing.
I have about 100 active listings, 6 in drafts - one of which I am trying to put live.
The item is a single very normal history paperback book.

Any ideas??