I am creating a listing, I added a category for it, one that I found on the list. But it's now stuck telling me that I need to add a category.
No idea I'm afraid but perhaps someone else will see this post if I bump it.
Are you using the app or a browser? Try using a browser.
Add a different category and see if you can save it as a draft until you can figure out the category problem.
@CALegerCreations all of your listings should be under "Craft supplies & tools" category.