Bukkit

What steps will reproduce the problem?
1. /ri egg (name) (name)

What is the expected output? What do you see instead?
It should a boss egg, But I get an internal error.

2013-09-30 22:42:01 [INFO] deimos161 issued server command: /ri egg slimer test
2013-09-30 22:42:01 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'ri' in plugin RareItemHunter v1.4.8
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:192)
    at org.bukkit.craftbukkit.v1_6_R2.CraftServer.dispatchCommand(CraftServer.java:523)
    at net.minecraft.server.v1_6_R2.PlayerConnection.handleCommand(PlayerConnection.java:954)
    at net.minecraft.server.v1_6_R2.PlayerConnection.chat(PlayerConnection.java:872)
    at net.minecraft.server.v1_6_R2.PlayerConnection.a(PlayerConnection.java:829)
    at net.minecraft.server.v1_6_R2.Packet3Chat.handle(SourceFile:49)
    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.NullPointerException
    at com.ne0nx3r0.rareitemhunter.command.RareItemHunterCommandExecutor._spawnEgg(RareItemHunterCommandExecutor.java:301)
    at com.ne0nx3r0.rareitemhunter.command.RareItemHunterCommandExecutor.onCommand(RareItemHunterCommandExecutor.java:75)
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
    ... 15 more

What version of the product are you using?
RareItemHunter v1.4.8