help needed with a error

ik heb een probleem met een plugin ik wil wat maken voor een rollplay server maar er zit een error in en ik weet niet hoe ik dat kan fixen, dit is de console:

Code:

[14:12:10 ERROR]: Could not pass event ProjectileHitEvent to scandineahoe v1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:294) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:501) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:486) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at org.bukkit.craftbukkit.v1_7_R1.event.CraftEventFactory.callProjectile
HitEvent(CraftEventFactory.java:609) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g8
5f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.EntityArrow.h(EntityArrow.java:212) [cra
ftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.World.entityJoinedWorld(World.java:1348)
[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.World.playerJoinedWorld(World.java:1329)
[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.World.tickEntities(World.java:1217) [cra
ftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.WorldServer.tickEntities(WorldServer.jav
a:480) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:6
37) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
50) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
45) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_7_R1.entity.C
raftArrow cannot be cast to org.bukkit.entity.Snowball
        at me.beno65dev.scandinea.Main.onHit(Main.java:54) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
_67]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
_67]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.7.0_67]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_67]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:292) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        ... 14 more
>rl
[14:16:40 INFO]: [scandineahoe] Disabling scandineahoe v1.0
[14:16:40 INFO]: [scandineahoe] Loading scandineahoe v1.0
[14:16:40 INFO]: [scandineahoe] Enabling scandineahoe v1.0
[14:16:40 INFO]: Server permissions file permissions.yml is empty, ignoring it
[14:16:40 INFO]: CONSOLE: Reload complete.
[14:16:42 ERROR]: Could not pass event ProjectileHitEvent to scandineahoe v1.0
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:294) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:501) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:486) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at org.bukkit.craftbukkit.v1_7_R1.event.CraftEventFactory.callProjectile
HitEvent(CraftEventFactory.java:609) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g8
5f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.EntityArrow.h(EntityArrow.java:212) [cra
ftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.World.entityJoinedWorld(World.java:1348)
[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.World.playerJoinedWorld(World.java:1329)
[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.World.tickEntities(World.java:1217) [cra
ftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.WorldServer.tickEntities(WorldServer.jav
a:480) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.u(MinecraftServer.java:6
37) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.DedicatedServer.u(DedicatedServer.java:2
50) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.t(MinecraftServer.java:5
45) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.MinecraftServer.run(MinecraftServer.java
:457) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        at net.minecraft.server.v1_7_R1.ThreadServerApplication.run(SourceFile:6
17) [craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_7_R1.entity.C
raftArrow cannot be cast to org.bukkit.entity.Snowball
        at me.beno65dev.scandinea.Main.onHit(Main.java:54) ~[?:?]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0
_67]
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0
_67]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1
.7.0_67]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_67]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:292) ~[craftbukkit.jar:git-Bukkit-1.7.2-R0.3-2-g85f5776-b3024jnks]
        ... 14 more

and this is the event where the error is:

Code:java

@SuppressWarnings("deprecation")
    @EventHandler
    public void onHit(ProjectileHitEvent e){
        Projectile p = e.getEntity();
        Snowball s = (Snowball) e.getEntity();
        if ((p instanceof Snowball)) return;
            if (e.getEntity().getShooter() instanceof Player){
                for (Entity en : s.getNearbyEntities(3, 3, 3)){
                      if (en instanceof Player) {
                          Player pl = (Player) en;
                          if (!(pl == e.getEntity().getShooter())) pl.addPotionEffect(new PotionEffect(PotionEffectType.SLOW, 100, 5));
                  }
                }
        }
    }

i hope you can help me

 

Snowball s = (Snowball) e.getEntity(); //ERROR
once more, Check before casting!!!
if(p instanceof Snowball){
Snowball s = (Snowball) e.getEntity();
}