2012-11-24 15:21:15 [SEVERE] Could not load 'plugins/LWC.jar' in folder 'plugins'

org.bukkit.plugin.InvalidPluginException: java.lang.VerifyError: class com.griefcraft.lwc.LWCPlugin overrides final method getClassLoader.()Ljava/lang/ClassLoader;

	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:154)

	at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:305)

	at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:230)

	at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:227)

	at org.bukkit.craftbukkit.CraftServer.(CraftServer.java:205)

	at net.minecraft.server.ServerConfigurationManagerAbstract.(ServerConfigurationManagerAbstract.java:51)

	at net.minecraft.server.ServerConfigurationManager.(SourceFile:11)

	at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:111)

	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:398)

	at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)

Caused by: java.lang.VerifyError: class com.griefcraft.lwc.LWCPlugin overrides final method getClassLoader.()Ljava/lang/ClassLoader;

	at java.lang.ClassLoader.defineClass1(Native Method)

	at java.lang.ClassLoader.defineClass(Unknown Source)

	at java.security.SecureClassLoader.defineClass(Unknown Source)

	at java.net.URLClassLoader.defineClass(Unknown Source)

	at java.net.URLClassLoader.access$100(Unknown Source)

	at java.net.URLClassLoader$1.run(Unknown Source)

	at java.net.URLClassLoader$1.run(Unknown Source)

	at java.security.AccessController.doPrivileged(Native Method)

	at java.net.URLClassLoader.findClass(Unknown Source)

	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:44)

	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)

	at java.lang.ClassLoader.loadClass(Unknown Source)

	at java.lang.ClassLoader.loadClass(Unknown Source)

	at java.lang.Class.forName0(Native Method)

	at java.lang.Class.forName(Unknown Source)

	at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:143)

	... 9 more