2013-03-16 03:37:20 [SEVERE] Could not load 'plugins/iDisguise_v1.5.5.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: net/minecraft/server/v1_4_R1/Packet
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:182)
	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:307)
	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:231)
	at org.bukkit.craftbukkit.v1_5_R1.CraftServer.loadPlugins(CraftServer.java:261)
	at org.bukkit.craftbukkit.v1_5_R1.CraftServer.<init>(CraftServer.java:239)
	at net.minecraft.server.v1_5_R1.PlayerList.<init>(PlayerList.java:55)
	at net.minecraft.server.v1_5_R1.DedicatedPlayerList.<init>(SourceFile:11)
	at net.minecraft.server.v1_5_R1.DedicatedServer.init(DedicatedServer.java:109)
	at net.minecraft.server.v1_5_R1.MinecraftServer.run(MinecraftServer.java:387)
	at net.minecraft.server.v1_5_R1.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.NoClassDefFoundError: net/minecraft/server/v1_4_R1/Packet
	at de.robingrether.idisguise.iDisguise.<init>(iDisguise.java:24)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:178)
	... 9 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_4_R1.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(ClassLoader.java:423)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
	... 15 more