2012-06-27 01:11:01 [SEVERE] Error occurred while enabling Essentials v2.9.1 (Is it up to date?)
java.lang.NoSuchMethodError: com.google.common.cache.CacheBuilder.build(Lcom/google/common/cache/CacheLoader;)Lcom/google/common/cache/Cache;
	at com.earth2me.essentials.UserMap.<init>(UserMap.java:18)
	at com.earth2me.essentials.Essentials.onEnable(Essentials.java:167)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:215)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:386)
	at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:263)
	at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:245)
	at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:392)
	at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:379)
	at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:207)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:443)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)