PlayerVaults - Per World Permission Help?

I'm trying to the achieve that PlayerVaults can be only be accessed in the hub world which is "world", and the soon to be survival/factions world. I've tried messing around with the permissions, and nothing is working.

I just want PlayerVaults to be used in certain worlds.
http://pastebin.com/tY6AjsR8

groups:
Peasant:
build: true
permissions:
- modifyworld.*
- essentials.rules
- essentials.help
- essentials.pay
- essentials.balance
- essentials.tell
- essentials.sell
- essentials.back
- essentials.who
- essentials.afk
- essentials.list
- essentials.msg
- essentials.warp.list
- essentials.warp
- essentials.motd
- essentials.spawn
- essentials.home
- essentials.tpa
- essentials.tpahere
- essentials.tpaccept
- essentials.home
- essentials.sethome
- factions.join
- factions.create
- factions.disband
- factions.leave
- factions.help
- factions.title
- factions.relation
- factions.who
- factions.admin
- factions.power
- factions.claim
- factions.unclaim
- factions.description
- factions.mod
- factions.list
- factions.home
- factions.sethome
- factions.unclaimall
- factions.kick
- factions.invite
- factions.map
- factions.show
- factions.disband
- factions.chat
- mcmmo.ability.*
- mcmmo.skills.*
- chestshop.buy
- chestshop.sell
- plotme.use.claim
- plotme.use.auto
- plotme.use.info
- plotme.use.clear
- plotme.use.add
- plotme.use.remove
- plotme.limit.1
- multiverse.access.plotworld
- multiverse.portal.access.creative
worlds:
world:
permissions:
- -playervaults.commands.use
options:
prefix: '&8[&fPeasant&8]&7'
default: true​

 

I am using PermissionsEx.