Errors for TempleCraft (MC Bukkit

20:17:59 [SEVERE] Error occurred while enabling TempleCraft v0.4 (Is it up to da
te?): org/bukkit/configuration/file/YamlConfiguration
java.lang.NoClassDefFoundError: org/bukkit/configuration/file/YamlConfiguration
        at com.msingleton.templecraft.TCUtils.getInt(TCUtils.java:192)
        at com.msingleton.templecraft.TempleManager.init(TempleManager.java:77)
        at com.msingleton.templecraft.TempleCraft.onEnable(TempleCraft.java:52)
        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(SimplePluginManage
r.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: org.bukkit.configuration.file.YamlC
onfiguration
        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)
        ... 13 more