Bukkit

What steps will reproduce the problem?
1. Start server
2. Let players play
3. See console

> 12:15:00 [SEVERE] Could not pass event ResidenceChangedEvent to resperm v0.9.2
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
at com.bekvon.bukkit.residence.listeners.ResidencePlayerListener.handleNewLocation(ResidencePlayerListener.java:513)
at com.bekvon.bukkit.residence.listeners.ResidencePlayerListener.onPlayerTeleport(ResidencePlayerListener.java:395)
at sun.reflect.GeneratedMethodAccessor125.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
at org.bukkit.craftbukkit.v1_6_R2.entity.CraftPlayer.teleport(CraftPlayer.java:382)
at org.bukkit.craftbukkit.v1_6_R2.entity.CraftEntity.teleport(CraftEntity.java:199)
at uk.org.whoami.authme.listener.AuthMePlayerListener.onPlayerJoin(AuthMePlayerListener.java:775)
at sun.reflect.GeneratedMethodAccessor423.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
at net.minecraft.server.v1_6_R2.PlayerList.c(PlayerList.java:207)
at net.minecraft.server.v1_6_R2.PlayerList.a(PlayerList.java:103)
at net.minecraft.server.v1_6_R2.PendingConnection.e(PendingConnection.java:133)
at net.minecraft.server.v1_6_R2.PendingConnection.d(PendingConnection.java:43)
at net.minecraft.server.v1_6_R2.DedicatedServerConnectionThread.a(DedicatedServerConnectionThread.java:41)
at net.minecraft.server.v1_6_R2.DedicatedServerConnection.b(SourceFile:29)
at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:590)
at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:226)
at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:486)
at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:419)
at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.IllegalArgumentException: Given attachment is not part of Permissible object CraftPlayer{name=Venus_Girl}
at org.bukkit.permissions.PermissibleBase.removeAttachment(PermissibleBase.java:144)
at org.bukkit.craftbukkit.v1_6_R2.entity.CraftHumanEntity.removeAttachment(CraftHumanEntity.java:135)
at me.kolorafa.resperm.resperm.removePerms(resperm.java:111)
at me.kolorafa.resperm.resperm.playermove2(resperm.java:82)
at me.kolorafa.resperm.resperm.leaveEvent(resperm.java:94)
at sun.reflect.GeneratedMethodAccessor288.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
... 33 more

How often does it happen, how much players do you have, does that player have previously some fail join, eg was banned?

It happens when they go to residence (or leave). I have about 10 players at once on my server (not big server)...

No fails, no bans... it does only sometimes and it does not have effect on functionality of resperm... but it generates this error and I don't like errors :D

It happens when players log in server too (using Authme)