In the new update ( 1.9.0.15 / 1.10 ) you can't summon the NPC. Instead, you need to create a world on world on update 1.9.0.0 to summon it. This world has an NPC and you can now try out the new feature of NPC on 1.10.0.3
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Changelog
Now NPC work on update 1.10.0.3 and in update 1.10.0.4
lol it killed everything
Una solución please !
#FIRST COMMET