Looks like in the JSON, all of your attachments are defined under different skins like "Businessman", but the default skin is empty.
I'm not sure if this was the original setup.
Were you the one who created this project and exported the json?
Did the default skin originally have attachments in it?
(The "default" skin is what is visible when you have no skins selected under the Skins node.)
Let's see if Nate can confirm any weird things happening here and fix bugs.
He may need you to email them the spine project.