2011-10-17 12:55:49 [SEVERE] Error occurred while disabling mChatEssentials v1.8.1_2 (Is it up to date?): org/bukkit/configuration/InvalidConfigurationException
java.lang.NoClassDefFoundError: org/bukkit/configuration/InvalidConfigurationException
	at net.D3GN.MiracleM4n.mChatEssentials.mChatEssentials.onDisable(mChatEssentials.java:115)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:128)
	at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoader.java:962)
	at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:296)
	at net.D3GN.MiracleM4n.mChatEssentials.mChatEssentials.getmChat(mChatEssentials.java:143)
	at net.D3GN.MiracleM4n.mChatEssentials.mChatEssentials.onEnable(mChatEssentials.java:58)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:126)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:941)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:280)
	at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:174)
	at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:157)
	at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:297)
	at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:284)
	at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:152)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:348)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:417)
Caused by: java.lang.ClassNotFoundException: org.bukkit.configuration.InvalidConfigurationException
	at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:36)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:24)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:334)
	... 16 more