Error Message help PEX

Error Message: at ru.tehkode.permissions.bukkit.PermissionsEx.getPermissionManager(PermissionsEx.java:156)
	at ru.tehkode.permissions.bukkit.PermissionsEx$PlayerEventsListener.onPlayerQuit(PermissionsEx.java:216)
	at org.bukkit.plugin.java.JavaPluginLoader$2.execute(JavaPluginLoader.java:267)
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:58)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:339)
	at net.minecraft.server.ServerConfigurationManager.disconnect(ServerConfigurationManager.java:161)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:650)
	at net.minecraft.server.NetworkManager.b(NetworkManager.java:231)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:92)
	at net.minecraft.server.NetworkListenThread.a(SourceFile:108)
	at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:516)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:414)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:457)

Permissions: groups:
    Default:
        default: true
        permissions:
        - modifyworld.*
        - 'CommandBin.teleport.spawn*'
        - 'CommandBin.general.warp*'
        - 'CommandBin.general.me*'
        - 'CommandBin.general.sethome*'
        - 'CommandBin.general.help*'
        - 'CommandBin.general.home*'
        - 'CommandBin.general.msg*'
        - 'CommandBin.general.who*'
        - 'towny.town.*'
        - 'towny.town.spawn.*'
        - 'towny.town.toggle.*'
        - 'towny.nation.*'
        - 'towny.chat.town*'
        - 'towny.top*'
        - 'iConomy.access*'
        - 'iConomy.payment*'
        - 'iConomy.rank*'
        - 'iConomy.list*'
        - 'lwc.protect*'
        - 'ChestShop.shop.create*'
        - 'ChestShop.shop.buy*'
        - 'ChestShop.shop.sell*'
        - '*'
        - '*'
   prefix: '&3[DEF]&1

  Mod:
     inheritence: [DEF]
     default: false
     permissions:
     - 'CommandBin.general.kill*'
     - 'CommandBin.general.mob*'
     - 'CommandBin.general.clear*'
     - 'CommandBin.general.slap*'
     - 'CommandBin.general.godmode*'
     - 'CommandBin.general.freeze*'
     - 'CommandBin.general.unfreeze*'
     - 'CommandBin.general.survival*'
     - 'CommandBin.general.creative*'
     - 'CommandBin.general.banip*'
     - 'CommandBin.general.kick*'
     - 'CommandBin.general.ban*'
     - 'CommandBin.general.unban*'
     - 'CommandBin.teleport.put*'
     - 'CommandBin.general.weather*'
     - 'CommandBin.general.leave*'
     - 'CommandBin.teleport.tp*'
     - 'CommandBin.teleport.tphere*'
     - 'ChestShop.mod*'
     - 'lwc.mod*'
     - 'towny.chat.mod*'
     - '*'
     - '*'
     - '*'
     - '*'
     - '*'
     - '*'
     - '*'
     - '*'
     - '*'
     - '*'
     - '*'
     - '*'
     - '*'
     - '*'
     prefix: '&b[&2MOD&4]&a'

Plugins:
Chatmanager
Chestshop
Commandbin
iConomy
JailLikeHell
LWC
Modifyworld
PermissionsEx
Questioner
Register
Towny
Townychat
Worldedit