14:56:31 [INFO] Starting minecraft server version Beta 1.6.6
14:56:31 [INFO] Loading properties
14:56:31 [INFO] Starting Minecraft server on 127.0.0.1:25565
14:56:31 [WARNING] **** SERVER IS RUNNING IN OFFLINE/INSECURE MODE!
14:56:31 [WARNING] The server will make no attempt to authenticate usernames. Beware.
14:56:31 [WARNING] While this makes the game possible to play without internet access, it also opens up the ability for hackers to connect with any username they choose.
14:56:31 [WARNING] To change this, set "online-mode" to "true" in the server.settings file.
14:56:31 [INFO] This server is running Craftbukkit version git-Bukkit-0.0.0-823-gb9d0b04-b860jnks (MC: 1.6.6)
14:56:32 [INFO] Preparing level "flat"
14:56:32 [INFO] Preparing start region for level 0
14:56:32 [INFO] Preparing start region for level 1
14:56:33 [INFO] Preparing spawn area: 20%
14:56:34 [WARNING] Version mismatch! Please update EssentialsSpawn to the same version.
14:56:34 [INFO] Loaded Essentials build 2.2.8 maintained by Zenexer, ementalo, Aelux, Brettflan, KimKandor, snowleo and ceulemans.
14:56:34 [SEVERE] Error occurred while enabling EssentialsSpawn v2.3.3 (Is it up to date?): com/earth2me/essentials/IUser
java.lang.NoClassDefFoundError: com/earth2me/essentials/IUser
	at com.earth2me.essentials.spawn.EssentialsSpawn.onEnable(EssentialsSpawn.java:25)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:125)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:799)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:253)
	at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:140)
	at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:118)
	at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:232)
	at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:219)
	at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:146)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:283)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:422)
Caused by: java.lang.ClassNotFoundException: com.earth2me.essentials.IUser
	at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:36)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:24)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
	... 11 more