Bukkit

What steps will reproduce the problem?
1.I
2.Dont
3.Know

What is the expected output? What do you see instead?
I honstly dont know

What version of the product are you using?
latest one, um i dont know what one let me check............................................
v0.2.1

Do you have an error log of what happened?
yes, this is it

[i]==================================
========  MC SERVER SOFT  ========
==================================
=                                =
==================================
=       Server Initializer       =
==================================
182 recipes
27 achievements
18:45:30 [INFO] Starting minecraft server version 1.2.5
18:45:30 [INFO] Loading properties
18:45:30 [INFO] Starting Minecraft server on ************
18:45:30 [INFO] This server is running CraftBukkit version git-Bukkit-1.2.5-R1.0
-b2149jnks (MC: 1.2.5) (Implementing API version 1.2.5-R1.0)
18:45:31 [SEVERE] Could not load 'plugins\Kingdoms.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.NoClassDefFoundError: org/bu
kkit/event/player/PlayerListener
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:148)
        at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.
java:305)
        at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager
.java:230)
        at org.bukkit.craftbukkit.CraftServer.loadPlugins(CraftServer.java:207)
        at org.bukkit.craftbukkit.CraftServer.<init>(CraftServer.java:183)
        at net.minecraft.server.ServerConfigurationManager.<init>(ServerConfigur
ationManager.java:53)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:156)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:422)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.NoClassDefFoundError: org/bukkit/event/player/PlayerListene
r
        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 com.montropolis.Kingdoms.Kingdoms.<init>(Kingdoms.java:51)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

        at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)

        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Sou
rce)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.j
ava:144)
        ... 8 more
Caused by: java.lang.ClassNotFoundException: org.bukkit.event.player.PlayerListe
ner
        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[/i]

Please provide any additional information below.
I just downloaded it and then i put the .jar in the "plugins folder and this. i have java 7, im running a 1.2.5 server-bukkit

Make sure your using the latest kingdoms plugin found here: http://dev.bukkit.org/server-mods/kingdoms-plugin/files/8-kingdoms-v0-2-3/

If you just click download it sends you to the old version!