PermissionsEX not working

In permissionsex, the fact is , the prefix isnt visible and i guess it isnt even working at all. If i do /pex promote<name> , it doesnt show up anythin. yml syntax:

groups:
Member:
default: true
permissions:
- essentials.afk
- essentials.help
- spawn.spawn
prefix: '&f[&7Member&f]'
VIP:
inheritance:
- Member
permissions:
- simplefly.fly
- essentials.chat.color
prefix: '&f[&9VIP&f]'
VIP+:
inheritance:
- VIP
permissions:
- essentials.firework
- essentials.chat.color
prefix: '&f[&9VIP&e+&f]'
TeamElite:
inheritance:
- VIP+
permissions:
- essentials.suicide
- essentials.vanish
prefix: '&f[&bElite&f]'
Moderator:
inheritance:
- TeamElite
permissions:
- essentials.gamemode
- essentials.mute
- essentials.tp
- essentials.gm
- essentials.kick
- vanish.vanish
- essentials.nick
prefix: '&f[&6Moderator&f]'
Admin:
inheritance:
- Moderator
- Member
permissions:
- disguisecraft.player.*
prefix: '&f[&cAdmin&f]'
Owner:
inheritance:
- Admin
- Member
permissions:
- '*'
prefix: '&f[&4Owner&f]'

 

What version of CB are you running?
If your running 1.7.5 or below, PEX might not work.

 

This should not be in Plugin Development.

You should post a ticket or put it on the forum of the plugin page here:
http://dev.bukkit.org/bukkit-plugins/permissionsex/