Please Help, LogBlock 1.50 Problems

22:15:28 [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(JavaPluginLoad
er.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(SimplePluginManage
r.java:381)
        at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:256)
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:238
)
        at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:372)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:359)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:188)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:423)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.ClassNotFoundException: org.bukkit.event.block.BlockListene
r
        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


AND....

22:15:27 [SEVERE] Error occurred while enabling LogBlockQuestioner v0.02 (Is it
up to date?)
java.lang.NoClassDefFoundError: org/bukkit/event/Event$Type
        at de.diddiz.LogBlockQuestioner.LogBlockQuestioner.onEnable(LogBlockQues
tioner.java:15)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:215)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:336)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:381)
        at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:256)
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:238
)
        at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:372)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:359)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:188)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:423)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.ClassNotFoundException: org.bukkit.event.Event$Type
        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)
        ... 11 more

AND...

22:15:27 [SEVERE] Error occurred while enabling LogBlockQuestioner v0.02 (Is it
up to date?)
java.lang.NoClassDefFoundError: org/bukkit/event/Event$Type
        at de.diddiz.LogBlockQuestioner.LogBlockQuestioner.onEnable(LogBlockQues
tioner.java:15)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:215)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader
.java:336)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManage
r.java:381)
        at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:256)
        at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:238
)
        at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:372)
        at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:359)
        at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:188)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:423)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.ClassNotFoundException: org.bukkit.event.Event$Type
        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)
        ... 11 more