EntitiManager

2013-08-23 14:18:31 [SEVERE] Could not pass event ProjectileLaunchEvent to EntityManager v5.4.1
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 org.bukkit.craftbukkit.v1_6_R2.event.CraftEventFactory.callProjectileLaunchEvent(CraftEventFactory.java:584)
    at net.minecraft.server.v1_6_R2.World.addEntity(World.java:928)
    at net.minecraft.server.v1_6_R2.World.addEntity(World.java:895)
    at net.minecraft.server.v1_6_R2.ItemPotion.a(SourceFile:115)
    at net.minecraft.server.v1_6_R2.ItemStack.a(ItemStack.java:93)
    at net.minecraft.server.v1_6_R2.PlayerInteractManager.useItem(PlayerInteractManager.java:342)
    at net.minecraft.server.v1_6_R2.PlayerConnection.a(PlayerConnection.java:610)
    at net.minecraft.server.v1_6_R2.Packet15Place.handle(SourceFile:58)
    at net.minecraft.server.v1_6_R2.NetworkManager.b(NetworkManager.java:296)
    at net.minecraft.server.v1_6_R2.PlayerConnection.e(PlayerConnection.java:116)
    at net.minecraft.server.v1_6_R2.ServerConnection.b(SourceFile:37)
    at net.minecraft.server.v1_6_R2.DedicatedServerConnection.b(SourceFile:30)
    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: Instant potions cannot be extended
    at org.apache.commons.lang.Validate.isTrue(Validate.java:157)
    at org.bukkit.potion.Potion.setHasExtendedDuration(Potion.java:253)
    at org.bukkit.potion.Potion.extend(Potion.java:137)
    at net.milkycraft.Utility.fromDamage(Utility.java:140)
    at net.milkycraft.AuxiliaryListener.onProjectileLaunch(AuxiliaryListener.java:146)
    at sun.reflect.GeneratedMethodAccessor425.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)
    ... 20 more