Help plugin errror

anybody nows how to fix this ?


15:18:05 [SEVERE] Could not pass event FoodLevelChangeEvent to ClassicHealth
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:332)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
at org.bukkit.craftbukkit.event.CraftEventFactory.callFoodLevelChangeEvent(CraftEventFactory.java:427)
at net.minecraft.server.FoodMetaData.a(FoodMetaData.java:36)
at net.minecraft.server.EntityHuman.h_(EntityHuman.java:209)
at net.minecraft.server.EntityPlayer.g(EntityPlayer.java:203)
at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:128)
at net.minecraft.server.ServerConnection.b(SourceFile:35)
at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:583)
at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:476)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
Caused by: java.lang.NoClassDefFoundError: ru/tehkode/permissions/bukkit/PermissionsEx
at org.Dragonphase.ClassicHealth.ClassicHealth.onFoodLevelChange(ClassicHealth.java:150)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:330)