TF2 Error

11.12 09:46:06 [Server] INFO ... 18 more
11.12 09:46:06 [Server] INFO at java.lang.ClassLoader.loadClass(Unknown Source)
11.12 09:46:06 [Server] INFO at java.lang.ClassLoader.loadClass(Unknown Source)
11.12 09:46:06 [Server] INFO at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)
11.12 09:46:06 [Server] INFO at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:34)
11.12 09:46:06 [Server] INFO Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_4_5.NBTBase
11.12 09:46:06 [Server] INFO ... 15 more
11.12 09:46:06 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
11.12 09:46:06 [Server] INFO at me.chaseoes.tf2.commands.CommandManager.onCommand(CommandManager.java:146)
11.12 09:46:06 [Server] INFO at me.chaseoes.tf2.commands.SetCommand.execSetCommand(SetCommand.java:46)
11.12 09:46:06 [Server] INFO Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/v1_4_5/NBTBase
11.12 09:46:06 [Server] INFO at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
11.12 09:46:06 [Server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
11.12 09:46:06 [Server] INFO at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
11.12 09:46:06 [Server] INFO at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
11.12 09:46:06 [Server] INFO at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:595)
11.12 09:46:06 [Server] INFO at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
11.12 09:46:06 [Server] INFO at net.minecraft.server.ServerConnection.b(SourceFile:39)
11.12 09:46:06 [Server] INFO at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:113)
11.12 09:46:06 [Server] INFO at net.minecraft.server.NetworkManager.b(NetworkManager.java:290)
11.12 09:46:06 [Server] INFO at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
11.12 09:46:06 [Server] INFO at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:858)
11.12 09:46:06 [Server] INFO at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:903)
11.12 09:46:06 [Server] INFO at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:985)
11.12 09:46:06 [Server] INFO at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:502)
11.12 09:46:06 [Server] INFO at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
11.12 09:46:06 [Server] INFO at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
11.12 09:46:06 [Server] INFO org.bukkit.command.CommandException: Unhandled exception executing command 'tf2' in plugin TF2 v1.4
11.12 09:46:06 [Server] SEVERE null