2013-10-01 02:25:55 [SEVERE] Could not pass event EntityDamageByEntityEvent to Popper v1.1
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.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:30)
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478)
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463)
	at org.bukkit.craftbukkit.v1_6_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:94)
	at org.bukkit.craftbukkit.v1_6_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:398)
	at org.bukkit.craftbukkit.v1_6_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:423)
	at net.minecraft.server.v1_6_R3.EntityLiving.damageEntity(EntityLiving.java:644)
	at net.minecraft.server.v1_6_R3.EntityHuman.damageEntity(EntityHuman.java:719)
	at net.minecraft.server.v1_6_R3.EntityPlayer.damageEntity(EntityPlayer.java:399)
	at net.minecraft.server.v1_6_R3.EntityHuman.attack(EntityHuman.java:889)
	at net.minecraft.server.v1_6_R3.PlayerConnection.a(PlayerConnection.java:1148)
	at net.minecraft.server.v1_6_R3.Packet7UseEntity.handle(SourceFile:36)
	at org.spigotmc.netty.NettyNetworkManager.b(NettyNetworkManager.java:230)
	at net.minecraft.server.v1_6_R3.PlayerConnection.e(PlayerConnection.java:116)
	at net.minecraft.server.v1_6_R3.ServerConnection.b(SourceFile:37)
	at org.spigotmc.netty.NettyServerConnection.b(NettyServerConnection.java:132)
	at net.minecraft.server.v1_6_R3.MinecraftServer.t(MinecraftServer.java:594)
	at net.minecraft.server.v1_6_R3.DedicatedServer.t(DedicatedServer.java:240)
	at net.minecraft.server.v1_6_R3.MinecraftServer.s(MinecraftServer.java:483)
	at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:415)
	at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/v1_6_R2/Packet
	at com.Chris4315.Popper.Popper.onAttemptPop(Popper.java:32)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	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)
	... 22 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_6_R2.Packet
	at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:70)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 28 more