[14:48:33 ERROR]: Could not pass event EntityDeathEvent to LorinthsRpgMobs v2.3.4
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[towny.jar:git-Spigot-e4d4710-e1ebe52]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[towny.jar:git-Spigot-e4d4710-e1ebe52]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callEntityDeathEvent(CraftEventFactory.java:378) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.EntityLiving.die(EntityLiving.java:874) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.EntityZombie.die(EntityZombie.java:561) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.EntityLiving.damageEntity(EntityLiving.java:812) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.EntityMonster.damageEntity(EntityMonster.java:42) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.EntityZombie.damageEntity(EntityZombie.java:167) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.Entity.K(Entity.java:314) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.EntityLiving.K(EntityLiving.java:169) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.EntityInsentient.K(EntityInsentient.java:149) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.Entity.t_(Entity.java:247) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.EntityLiving.t_(EntityLiving.java:1448) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.EntityInsentient.t_(EntityInsentient.java:193) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.EntityMonster.t_(EntityMonster.java:24) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.EntityZombie.t_(EntityZombie.java:221) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.World.entityJoinedWorld(World.java:1607) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.World.g(World.java:1582) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.World.tickEntities(World.java:1425) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.WorldServer.tickEntities(WorldServer.java:597) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:786) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [towny.jar:git-Spigot-e4d4710-e1ebe52]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_60]
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to java.lang.Double
        at me.Lorinth.MobDifficulty.MobDifficulty.evaluateExp(MobDifficulty.java:2801) ~[?:?]
        at me.Lorinth.MobDifficulty.MobDifficulty.onMobDeath(MobDifficulty.java:1324) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor297.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_60]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_60]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[towny.jar:git-Spigot-e4d4710-e1ebe52]
        ... 26 more