v1.0-mc18w08b

Minecraft Update Aquatic completely changed the format of commands. Because of this, Barebones has almost completely been rewritten for the upcoming Minecraft 1.13 release.
Barebones 1.0+ is inherently different to its previous versions, therefore it lacks of some of the previous functionality. Some will be restored in future updates.
You can read about the functionality of Barebones 1.0 here.