Error Clearlag

2013-11-01 11:48:09 [SEVERE] Error occurred while enabling ClearLag v2.6.0 (Is it up to date?)
java.lang.NoClassDefFoundError: net/minecraft/server/v1_6_R3/Entity
at me.minebuilders.clearlag.Clearlag.addListeners(Clearlag.java:114)
at me.minebuilders.clearlag.Clearlag.onEnable(Clearlag.java:67)
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:382)
at org.bukkit.craftbukkit.v1_6_R2.CraftServer.loadPlugin(CraftServer.java:286)
at org.bukkit.craftbukkit.v1_6_R2.CraftServer.enablePlugins(CraftServer.java:268)
at net.minecraft.server.v1_6_R2.MinecraftServer.l(MinecraftServer.java:319)
at net.minecraft.server.v1_6_R2.MinecraftServer.f(MinecraftServer.java:296)
at net.minecraft.server.v1_6_R2.MinecraftServer.a(MinecraftServer.java:256)
at net.minecraft.server.v1_6_R2.DedicatedServer.init(DedicatedServer.java:164)
at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:397)
at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)
Caused by: java.lang.ClassNotFoundException: net.minecraft.server.v1_6_R3.Entity
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)
... 13 more