[16:53:41 ERROR]: Could not pass event NPCDeathEvent to Quester v0.6.3.6
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.citizensnpcs.EventListen.onEntityDeath(EventListen.java:227) [Citizens%20(1).jar:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_65]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_65]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_65]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_65]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.aufdemrand.sentry.SentryInstance.die(SentryInstance.java:556) [sentry.jar:?]
        at net.aufdemrand.sentry.SentryInstance.onDamage(SentryInstance.java:1232) [sentry.jar:?]
        at net.aufdemrand.sentry.SentryListener.onDamage(SentryListener.java:270) [sentry.jar:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_65]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_65]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_65]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_65]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:86) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:536) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:449) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.handleLivingEntityDamageEvent(CraftEventFactory.java:568) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.minecraft.server.v1_8_R3.EntityLiving.d(EntityLiving.java:1092) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.minecraft.server.v1_8_R3.EntityLiving.damageEntity(EntityLiving.java:733) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.minecraft.server.v1_8_R3.EntityMonster.damageEntity(EntityMonster.java:42) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.minecraft.server.v1_8_R3.EntityHuman.attack(EntityHuman.java:995) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.minecraft.server.v1_8_R3.EntityPlayer.attack(EntityPlayer.java:1048) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1289) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.minecraft.server.v1_8_R3.PacketPlayInUseEntity.a(SourceFile:52) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.minecraft.server.v1_8_R3.PacketPlayInUseEntity.a(SourceFile:11) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_65]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_65]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:673) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:335) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:629) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:537) [craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_65]
Caused by: java.lang.NoSuchMethodError: net.citizensnpcs.api.npc.NPC.getBukkitEntity()Lorg/bukkit/entity/LivingEntity;
        at com.gmail.molnardad.quester.listeners.Citizens2Listener.onNpcDeath(Citizens2Listener.java:166) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_65]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_65]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_65]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_65]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[craftbukkit-1.8.8.jar:git-Bukkit-18fbb24]
        ... 44 more