2013-01-02 13:10:15 [INFO] [NoCheatPlus] Enabling NoCheatPlus v3.8.1-RC-b244

2013-01-02 13:10:15 [SEVERE] Error occurred while enabling NoCheatPlus v3.8.1-RC-b244 (Is it up to date?)

java.lang.NoClassDefFoundError: net/minecraft/server/IBlockAccess

at fr.neatmonster.nocheatplus.NoCheatPlus.onEnable(NoCheatPlus.java:376)

at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)

at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)

at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)

at org.bukkit.craftbukkit.v1_4_6.CraftServer.loadPlugin(CraftServer.java:278)

at org.bukkit.craftbukkit.v1_4_6.CraftServer.enablePlugins(CraftServer.java:260)

at net.minecraft.server.v1_4_6.MinecraftServer.j(MinecraftServer.java:321)

at net.minecraft.server.v1_4_6.MinecraftServer.e(MinecraftServer.java:300)

at net.minecraft.server.v1_4_6.MinecraftServer.a(MinecraftServer.java:259)

at net.minecraft.server.v1_4_6.DedicatedServer.init(DedicatedServer.java:149)

at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:399)

at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)

Caused by: java.lang.ClassNotFoundException: net.minecraft.server.IBlockAccess

at org.bukkit.plugin.java.PluginClassLoader.findClass0(PluginClassLoader.java:70)

at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:53)

at java.lang.ClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

... 12 more