Something

java.lang.IndexOutOfBoundsException: Index: 4047, Size: 1
        at java.util.ArrayList.RangeCheck(Unknown Source)
        at java.util.ArrayList.remove(Unknown Source)
        at net.sf.l2j.gameserver.model.L2Character.enableSkill(L2Character.java:
4394)
        at net.sf.l2j.gameserver.model.L2Character$EnableSkill.run(L2Character.j
ava:278)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
        at java.util.concurrent.FutureTask.run(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
access$301(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
run(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source
)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)