Bukkit

What steps will reproduce the problem?
1.using radar set <player/mob>
2.
3.

What is the expected output? What do you see instead?
a small UI expected, error message "an internal error has occured" is shown instead

What version of the product are you using?
1.0.0

Do you have an error log of what happened?

11:52:57 AM [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'radar' in plugin BukkitRadar v1.0.0
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:189)
at org.bukkit.craftbukkit.v1_5_R3.CraftServer.dispatchCommand(CraftServer.java:523)
at net.minecraft.server.v1_5_R3.PlayerConnection.handleCommand(PlayerConnection.java:965)
at net.minecraft.server.v1_5_R3.PlayerConnection.chat(PlayerConnection.java:883)
at net.minecraft.server.v1_5_R3.PlayerConnection.a(PlayerConnection.java:840)
at net.minecraft.server.v1_5_R3.Packet3Chat.handle(Packet3Chat.java:44)
at net.minecraft.server.v1_5_R3.NetworkManager.b(NetworkManager.java:292)
at net.minecraft.server.v1_5_R3.PlayerConnection.d(PlayerConnection.java:109)
at net.minecraft.server.v1_5_R3.ServerConnection.b(SourceFile:35)
at net.minecraft.server.v1_5_R3.DedicatedServerConnection.b(SourceFile:30)
at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:581)
at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:226)
at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:477)
at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:410)
at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/v1_5_R2/Packet
at denniss17.bukkitRadar.BukkitRadar.showMobRadar(BukkitRadar.java:100)
at denniss17.bukkitRadar.BukkitRadarCommands.commandSet(BukkitRadarCommands.java:76)
at denniss17.bukkitRadar.BukkitRadarCommands.onCommand(BukkitRadarCommands.java:29)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
... 15 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_5_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(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 19 more

Please provide any additional information below.