Error (RacesAndClass Minecraft)

2013-12-13 11:27:28 [INFO] Debugger for Plugin:RacesAndClasses Version: 1.0.3 Started! System-Time: Fri Dec 13 11:27:28 GMT 2013
2013-12-13 11:29:32 [SEVERE] Error: java.lang.NullPointerException message: 'null'
2013-12-13 11:29:32 [SEVERE] de.tobiyas.racesandclasses.eventprocessing.TraitEventManager.fireEventIntern(TraitEventManager.java:171)
2013-12-13 11:29:32 [SEVERE] de.tobiyas.racesandclasses.eventprocessing.TraitEventManager.fireEvent(TraitEventManager.java:264)
2013-12-13 11:29:32 [SEVERE] de.tobiyas.racesandclasses.eventprocessing.Simple_event_executor.execute(Simple_event_executor.java:13)
2013-12-13 11:29:32 [SEVERE] org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
2013-12-13 11:29:32 [SEVERE] org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:478)
2013-12-13 11:29:32 [SEVERE] org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:463)
2013-12-13 11:29:32 [SEVERE] org.bukkit.craftbukkit.v1_7_R1.event.CraftEventFactory.callEntityDeathEvent(CraftEventFactory.java:345)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.EntityChicken.dropDeathLoot(EntityChicken.java:105)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.EntityLiving.die(EntityLiving.java:783)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.EntityLiving.damageEntity(EntityLiving.java:732)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.EntityAnimal.damageEntity(SourceFile:145)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.EntityHuman.attack(EntityHuman.java:923)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.PlayerConnection.a(PlayerConnection.java:1098)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.PacketPlayInUseEntity.a(SourceFile:55)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.PacketPlayInUseEntity.handle(SourceFile:10)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.NetworkManager.a(NetworkManager.java:146)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.ServerConnection.c(SourceFile:134)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:647)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:259)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:530)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java:442)
2013-12-13 11:29:32 [SEVERE] net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:617)