So the first screen you should have ticked the 'personal item sales'. And you did that. Then on the second screen you'll enter the gross amount from your 1099-K as well as any portion that should be excluded from income (fees and whatnot) and you did that. On the third screen you should enter the total amount from the 1099-K that represents the amounts sold at a loss. That should be fine.
Double check that when you entered the 1099-K that you checked the box that says "some items were sold at a loss" and not the box that says "all items were sold at a loss". In order to get back to that option you will have to delete the 1099-K and re-enter it. I don't get an error when inputting your data if I tick the "some items" box but I do if I tick the "all items".
@hcmetz
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