Bukkit

What steps will reproduce the problem?
1.plugin don,t work on my server .
2.
3.

What is the expected output? What do you see instead?

What version of the product are you using?
craftbukkit 1.5.2 2775

Do you have an error log of what happened?
21:26:34 [INFO] sys issued server command: /radar set mob
21:26:34 [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.