Hi ! I'm working on a map and i want to make a donjon, but i have a problem: when i use the command /summon Minecraft:wither_skeleton ~ ~ ~ it works, but if i want to give it a name or a weapon it says "Unable to summon entity"

The commands i tryed are:
- /summon minecraft:wither_skeleton ~ ~ ~ {CustomName:"Warrior [lvl.5]",CustomNameVisible:1}
(unable to summon entity)

- /summon minecraft:wither_skeleton ~ ~ ~ {Equipement:[{id:minecraft:iron_sword},{id:minecraft:iron_helmet}]}
(unable to summon entity)

- /summon minecraft:wither_skeleton ~ ~ ~ {NoAI:1}
it works but that's not what i want

I play minecraft in the last snapshot so i don't know if the command have changed (again) or if i just typed it wrong :/

Je ne savais pas qu'il y avait des anglophones sur le forum