17:46:07 [SEVERE] Could not pass event org.bukkit.event.block.BlockBreakEvent to
 Skillz
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$103.execute(JavaPluginLoader.
java:1026)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:61)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:460)
        at net.minecraft.server.ItemInWorldManager.breakBlock(ItemInWorldManager
.java:216)
        at net.minecraft.server.ItemInWorldManager.a(ItemInWorldManager.java:171
)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:517)
        at net.minecraft.server.Packet14BlockDig.handle(SourceFile:43)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:226)
        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:100)
        at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:7
8)
        at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:537)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:435)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:465)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.bukkit.plugin.java.JavaPluginLoader$103.execute(JavaPluginLoader.
java:1024)
        ... 12 more
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1
        at nl.lolmen.Skills.SkillBase.getItemOnLevelup(SkillBase.java:101)
        at nl.lolmen.Skills.CPU.giveItem(CPU.java:91)
        at nl.lolmen.Skills.CPU.levelUp(CPU.java:86)
        at nl.lolmen.Skills.CPU.checkLeveling(CPU.java:41)
        at nl.lolmen.Skills.SkillBase.addXP(SkillBase.java:65)
        at nl.lolmen.Skills.CPU.addXP(CPU.java:31)
        at nl.lolmen.Skills.SkillBlockListener.handleSkill(SkillBlockListener.ja
va:46)
        at nl.lolmen.Skills.SkillBlockListener.onBlockBreak(SkillBlockListener.j
ava:27)
        ... 16 more