Plugin Help PermissionsEx Help 1.7.10

got the plugin permissionsEx and when i do /pex literally nothing heppens. This is what i put in the Permissions.yml file
groups:
builder:
default: true
prefix: '&2[Builder]&f'
permissions:
- essentials.balance
- essentials.pay
- essentials.afk
- essentials.spawn
- essentials.home
- essentials.sethome
member:
default: false
prefix: '&3[Member]&f'
inheritance:
- builder
permissions:
- essentials.sell
- essentials.worth
- essentials.warp
- essentials.warp.list
- essentials.warps.*
- essentials.tpa
- essentials.tpaccept
- essentials.tpadeny
Owner:
default: false
prefix: '&4[Owner]&f'
inheritance:
- member
permissions:
- '*'
users:
iAboveAndBeyond:
group:
- Owner

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My plugins are
Pex
WorldEdit
WorldGuard
Essentials
EssentialsChat
EssentialsAntiBuild
EssentialsProtect
EssentialsSpawn


Any Help