2012-02-14 21:48:25 [SEVERE] Error occurred while enabling WorldEdit v5.2 (Is it up to date?): tried to access class com.sk89q.util.yaml.YAMLProcessor$FancyDumperOptions from class com.sk89q.util.yaml.YAMLProcessor
java.lang.IllegalAccessError: tried to access class com.sk89q.util.yaml.YAMLProcessor$FancyDumperOptions from class com.sk89q.util.yaml.YAMLProcessor
	at com.sk89q.util.yaml.YAMLProcessor.<init>(YAMLProcessor.java:86)
	at com.sk89q.util.yaml.YAMLProcessor.<init>(YAMLProcessor.java:98)
	at com.sk89q.worldedit.bukkit.WorldEditPlugin.onEnable(WorldEditPlugin.java:91)
	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)

2012-02-14 21:48:25 [SEVERE] Error occurred while enabling CommandBook v2.0 (Is it up to date?): com/sk89q/util/yaml/YAMLProcessor$FancyDumperOptions
java.lang.IllegalAccessError: com/sk89q/util/yaml/YAMLProcessor$FancyDumperOptions
	at com.sk89q.util.yaml.YAMLProcessor.<init>(YAMLProcessor.java:86)
	at com.sk89q.commandbook.CommandBook.populateConfiguration(CommandBook.java:208)
	at com.zachsthings.libcomponents.bukkit.BasePlugin.loadConfiguration(BasePlugin.java:106)
	at com.zachsthings.libcomponents.bukkit.BasePlugin.onEnable(BasePlugin.java:70)
	at com.sk89q.commandbook.CommandBook.onEnable(CommandBook.java:96)
	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)