Bukkit

When I add the "fast" argument to a command I get the following internal error:

epic plugin, please keep updated! My server loves this plugin.

Just having one issue:

Whenever I add the "fast" argument I get an "internal error" as follows: [17:39:54] [Server thread/INFO]: mattyluggs issued server command: /chorse spawn f:0.5 [17:39:54] [Server thread/ERROR]: null org.bukkit.command.CommandException: Unhandled exception executing command 'chorse' in plugin Custom_Horses v2.6 at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:701) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:956) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:817) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:47) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:667) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] Caused by: java.lang.NoClassDefFoundError: org/bukkit/craftbukkit/v1_7_R1/entity/CraftLivingEntity at me.ds1995.horses.commands.onCommand(commands.java:228) [?:?] at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) [minecraft_server.jar:git-Bukkit-1.7.9-R0.1-b3084jnks] ... 13 more

I also get the same error.