2011-09-22 05:17:40 [SEVERE] Error occurred while enabling MobArena v0.94.2 (Is it up to date?): com/nisovin/MagicSpells/Events/SpellListener
java.lang.NoClassDefFoundError: com/nisovin/MagicSpells/Events/SpellListener
    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:36)
    at org.bukkit.plugin.java.JavaPluginLoader.getClassByName(JavaPluginLoader.java:219)
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:32)
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:24)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at com.garbagemule.MobArena.MobArena.setupMagicSpells(MobArena.java:197)
    at com.garbagemule.MobArena.MobArena.onEnable(MobArena.java:76)
    at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:126)
    at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:920)
    at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:278)
    at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:173)
    at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:156)
    at net.minecraft.server.MinecraftServer.e(MinecraftServer.java:297)
    at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:284)
    at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:152)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:348)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:417)
Caused by: java.lang.ClassNotFoundException: com.nisovin.MagicSpells.Events.SpellListener
    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:36)
    at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:24)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    ... 27 more