Bukkit

What steps will reproduce the problem?
1.Just using server, no idea of the triggers, too many users to tell
2.its just a constant stream of this.
3.

What version of the product are you using? (Full/Moderate/Light + Version)
latest

Do you have an error log of what happened?

2012-12-01 19:27:12 [INFO] kendocole01 set the time of 'Survival' to 08:00 (8:00 am).
2012-12-01 19:27:12 [SEVERE] Could not pass event PlayerInteractEvent to Modifyworld v1.19.4
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:341)
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.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:177)
at net.minecraft.server.ItemInWorldManager.interact(ItemInWorldManager.java:376)
at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:662)
at net.minecraft.server.Packet15Place.handle(SourceFile:58)
at net.minecraft.server.NetworkManager.b(NetworkManager.java:290)
at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:113)
at net.minecraft.server.ServerConnection.b(SourceFile:39)
at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:595)
at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
Caused by: java.lang.ClassCastException: org.bukkit.material.MonsterEggs cannot be cast to org.bukkit.material.SpawnEgg
at ru.tehkode.modifyworld.handlers.PlayerListener.onPlayerInteract(PlayerListener.java:272)
at sun.reflect.GeneratedMethodAccessor753.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:339)
... 16 more

Please provide any additional information below.