ServerLog

2012-04-04 19:15:11 [INFO] [LogBlock] Enabling LogBlock v1.50
2012-04-04 19:15:11 [INFO] [LogBlock] Permissions plugin found.
2012-04-04 19:15:11 [SEVERE] Error occurred while enabling LogBlock v1.50 (Is it up to date?)
java.lang.NoClassDefFoundError: org/bukkit/event/block/BlockListener
	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.JavaPluginLoader.getClassByName(JavaPluginLoader.java:234)
	at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:37)
	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.diddiz.LogBlock.LogBlock.onEnable(LogBlock.java:124)
	at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:215)
	at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:336)
	at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
	at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:250)
	at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:232)
	at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:374)
	at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:361)
	at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:187)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:425)
	at net.minecraft.server.ThreadServerApplication.run(SourceFile:490)
Caused by: java.lang.ClassNotFoundException: org.bukkit.event.block.BlockListener
	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)
	... 26 more