[15:22:07 ERROR]: Could not pass event EntityDamageByEntityEvent to MobSpawner v
1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:320) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:481) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:466) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at org.bukkit.craftbukkit.v1_7_R1.event.CraftEventFactory.callEvent(Craf
tEventFactory.java:94) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jn
ks]
        at org.bukkit.craftbukkit.v1_7_R1.event.CraftEventFactory.callEntityDama
geEvent(CraftEventFactory.java:382) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g53
0fcb7-b2978jnks]
        at org.bukkit.craftbukkit.v1_7_R1.event.CraftEventFactory.handleEntityDa
mageEvent(CraftEventFactory.java:410) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g
530fcb7-b2978jnks]
        at net.minecraft.server.v1_7_R1.EntityLiving.damageEntity(EntityLiving.j
ava:656) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at net.minecraft.server.v1_7_R1.EntityAnimal.damageEntity(SourceFile:145
) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at net.minecraft.server.v1_7_R1.EntityArrow.h(EntityArrow.java:228) [cra
ftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at net.minecraft.server.v1_7_R1.World.entityJoinedWorld(World.java:1338)
 [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at net.minecraft.server.v1_7_R1.World.playerJoinedWorld(World.java:1319)
 [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at net.minecraft.server.v1_7_R1.World.tickEntities(World.java:1207) [cra
ftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at net.minecraft.server.v1_7_R1.WorldServer.tickEntities(WorldServer.jav
a:480) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:6
37) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
50) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
45) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_7_R1.entity.C
raftArrow cannot be cast to org.bukkit.entity.Snowball
        at me.moemix.mobspawner.MobSpawner.onsnowballfallevent(MobSpawner.java:3
5) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
_51]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
_51]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.7.0_51]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_51]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:318) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.2-3-g530fcb7-b2978jnks]