error log minecraft worldedit

2012-02-12 23:33:48 [SEVERE] Error occurred while enabling WorldEdit v5.2 (Is it up to date?): Invalid pc in LineNumberTable in class file com/sk89q/worldedit/EditSession
java.lang.ClassFormatError: Invalid pc in LineNumberTable in class file com/sk89q/worldedit/EditSession
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClassCond(Unknown Source)
	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$000(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:41)
	at org.bukkit.plugin.java.JavaPluginLoader.getClassByName(JavaPluginLoader.java:224)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:37)
	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.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
	at java.lang.Class.privateGetPublicMethods(Unknown Source)
	at java.lang.Class.getMethods(Unknown Source)
	at com.sk89q.minecraft.util.commands.CommandsManager.registerMethods(CommandsManager.java:176)
	at com.sk89q.minecraft.util.commands.CommandsManager.registerMethods(CommandsManager.java:145)
	at com.sk89q.minecraft.util.commands.CommandsManager.registerAndReturn(CommandsManager.java:127)
	at com.sk89q.worldedit.WorldEdit.<init>(WorldEdit.java:188)
	at com.sk89q.worldedit.bukkit.WorldEditPlugin.onEnable(WorldEditPlugin.java:99)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:231)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:1057)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:379)
	at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:191)
	at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:174)
	at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:357)
	at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:344)
	at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:175)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)