Bukkit

Could not pass event EntityDamageEvent to Smash vDev.0.1
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:26)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:479)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:464)
    at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callEvent(CraftEventFactory.java:89)
    at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.callEntityDamageEvent(CraftEventFactory.java:377)
    at org.bukkit.craftbukkit.v1_5_R3.event.CraftEventFactory.handleEntityDamageEvent(CraftEventFactory.java:433)
    at net.minecraft.server.v1_5_R3.EntityLiving.damageEntity(EntityLiving.java:681)
    at net.minecraft.server.v1_5_R3.EntityWaterAnimal.x(SourceFile:59)
    at net.minecraft.server.v1_5_R3.Entity.l_(Entity.java:261)
    at net.minecraft.server.v1_5_R3.EntityLiving.l_(EntityLiving.java:501)
    at net.minecraft.server.v1_5_R3.World.entityJoinedWorld(World.java:1456)
    at net.minecraft.server.v1_5_R3.WorldServer.entityJoinedWorld(WorldServer.java:622)
    at net.minecraft.server.v1_5_R3.World.playerJoinedWorld(World.java:1432)
    at net.minecraft.server.v1_5_R3.World.tickEntities(World.java:1304)
    at net.minecraft.server.v1_5_R3.WorldServer.tickEntities(WorldServer.java:520)
    at net.minecraft.server.v1_5_R3.MinecraftServer.r(MinecraftServer.java:562)
    at net.minecraft.server.v1_5_R3.DedicatedServer.r(DedicatedServer.java:227)
    at net.minecraft.server.v1_5_R3.MinecraftServer.q(MinecraftServer.java:472)
    at net.minecraft.server.v1_5_R3.MinecraftServer.run(MinecraftServer.java:404)
    at net.minecraft.server.v1_5_R3.ThreadServerApplication.run(SourceFile:573)
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_5_R3.entity.CraftSquid cannot be cast to org.bukkit.entity.Player
    at net.vortexmc.Bukkit.Smash.DoubleJump.onEntityDamage(DoubleJump.java:120)
    at sun.reflect.GeneratedMethodAccessor14.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:425)
    ... 21 more