1st error - when disguising as a mob
2012-08-19 18:01:23 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'md' in plugin MobDisguise v1.81
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:168)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:492)
	at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:878)
	at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:825)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:807)
	at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
	at net.minecraft.server.NetworkManager.b(NetworkManager.java:281)
	at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:109)
	at net.minecraft.server.ServerConnection.b(SourceFile:35)
	at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:583)
	at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
	at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:476)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.NoSuchFieldError: f
	at me.desmin88.mobdisguise.utils.PacketUtils.packetMaker(PacketUtils.java:146)
	at me.desmin88.mobdisguise.utils.PacketUtils.disguiseToAll(PacketUtils.java:61)
	at me.desmin88.mobdisguise.commands.MDCommand.onCommand(MDCommand.java:216)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
	... 15 more

2nd error - randomly occurred
2012-08-19 18:02:21 [WARNING] Task of 'MobDisguise' generated an exception
java.lang.NoSuchFieldError: f
	at me.desmin88.mobdisguise.utils.PacketUtils.packetMaker(PacketUtils.java:146)
	at me.desmin88.mobdisguise.utils.PacketUtils.disguiseToAll(PacketUtils.java:61)
	at me.desmin88.mobdisguise.utils.DisguiseTask.run(DisguiseTask.java:25)
	at org.bukkit.craftbukkit.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:126)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:512)
	at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
	at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:476)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)

3rd error - when trying to un-disguise
2012-08-19 18:02:39 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'md' in plugin MobDisguise v1.81
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:168)
	at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:492)
	at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:878)
	at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:825)
	at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:807)
	at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
	at net.minecraft.server.NetworkManager.b(NetworkManager.java:281)
	at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:109)
	at net.minecraft.server.ServerConnection.b(SourceFile:35)
	at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:583)
	at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
	at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:476)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.NoSuchMethodError: net.minecraft.server.Packet29DestroyEntity.<init>(I)V
	at me.desmin88.mobdisguise.utils.PacketUtils.undisguiseToAll(PacketUtils.java:44)
	at me.desmin88.mobdisguise.commands.MDCommand.onCommand(MDCommand.java:66)
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
	... 15 more