2011-09-08 17:51:06 [SEVERE] Error occurred while disabling xAuth v2.0b4.1 (Is it up to date?): loader constraint violation: loader (instance of org/bukkit/plugin/java/PluginClassLoader) previously initiated loading for a different type with name "org/h2/store/DataHandler"
java.lang.LinkageError: loader constraint violation: loader (instance of org/bukkit/plugin/java/PluginClassLoader) previously initiated loading for a different type with name "org/h2/store/DataHandler"
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:786)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:144)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:382)
	at java.net.URLClassLoader.access$100(URLClassLoader.java:75)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:294)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:288)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:287)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:36)
	at org.bukkit.plugin.java.JavaPluginLoader.getClassByName(JavaPluginLoader.java:219)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:32)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:24)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:422)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:355)
	at org.h2.store.LobStorage.init(LobStorage.java:89)
	at org.h2.store.LobStorage.removeAllForTable(LobStorage.java:147)
	at org.h2.engine.Database.close(Database.java:1046)
	at org.h2.engine.Database.removeSession(Database.java:964)
	at org.h2.engine.Session.close(Session.java:563)
	at org.h2.jdbc.JdbcConnection.close(JdbcConnection.java:363)
	at com.cypherx.xauth.database.Database.close(Database.java:140)
	at com.cypherx.xauth.xAuth.onDisable(xAuth.java:57)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:128)
	at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin(JavaPluginLoader.java:906)
	at org.bukkit.plugin.SimplePluginManager.disablePlugin(SimplePluginManager.java:294)
	at org.bukkit.plugin.SimplePluginManager.disablePlugins(SimplePluginManager.java:287)
	at org.bukkit.craftbukkit.CraftServer.disablePlugins(CraftServer.java:173)
	at net.minecraft.server.MinecraftServer.stop(MinecraftServer.java:314)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:393)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)