[Problem] Plugin xLevel

[luki215PL]

Gdy odpalam serwer wyświetla sie nastepujacy komunikat:

2012-03-09 23:51:33 [iNFO] Starting minecraft server version 1.2.3
2012-03-09 23:51:33 [iNFO] Loading properties
2012-03-09 23:51:33 [iNFO] Starting Minecraft server on 5.176.230.110:25565
2012-03-09 23:51:33 [iNFO] This server is running CraftBukkit version git-Bukkit-1.1-R6-39-g6d198be-b2040jnks (MC: 1.2.3) (Implementing API version 1.2.3-R0.2-SNAPSHOT)
2012-03-09 23:51:35 [sEVERE] Could not load 'plugins\xLevel.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: org/bukkit/event/player/PlayerListener
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:148)
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:287)
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:211)
at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:207)
at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:183)
at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigurationManager.java:56)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:156)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:425)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:490)
Caused by: java.lang.NoClassDefFoundError: org/bukkit/event/player/PlayerListener
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:41)
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 de.web.minecraftandi.xLevel.<init>(xLevel.java:19)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:144)
... 8 more
Caused by: java.lang.ClassNotFoundException: org.bukkit.event.player.PlayerListener
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:41)
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:29)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 27 more

Da sie cos z tym zrobic?