Bukkit

What steps will reproduce the problem?
i was attempting a first run of this plugin

What is the expected output? What do you see instead?

What version of the product are you using?
current, with stable version of spoutcraft

Do you have an error log of what happened?

10:18:17 [SEVERE] Error occurred while enabling OneMoooooreCow v1.0 (Is it up to
date?)
java.lang.NoSuchMethodError: randomman159.oneMoooooreCow.OneMoooooreCow.getConfi
guration()Lorg/bukkit/util/config/Configuration;
        at randomman159.oneMoooooreCow.OneMoooooreCow.onEnable(OneMoooooreCow.ja
va:50)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:374)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:381)
        at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:270)
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:252
)
        at net.minecraft.server.MinecraftServer.i(MinecraftServer.java:298)
        at net.minecraft.server.MinecraftServer.d(MinecraftServer.java:277)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:227)
        at net.minecraft.server.DedicatedServer.init(DedicatedServer.java:140)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:378)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Please provide any additional information below.
i took out every plugin except for spoutcraft and this plugin, error still happened