C:\Server\gameserver\data\scripts\ai\individual\Zaken.java
java.lang.ClassCastException: net.sf.l2j.gameserver.model.actor.instance.L2Grand
BossInstance cannot be cast to net.sf.l2j.gameserver.model.actor.instance.L2PcIn
stance
        at net.sf.l2j.gameserver.model.L2Character.doCast(L2Character.java:1103)

        at net.sf.l2j.gameserver.model.actor.instance.L2GrandBossInstance.doCast
(L2GrandBossInstance.java:61)
        at ai.individual.Zaken.onAdvEvent(Unknown Source)
        at net.sf.l2j.gameserver.model.quest.Quest.notifyEvent(Quest.java:299)
        at net.sf.l2j.gameserver.model.quest.QuestTimer$ScheduleTimerTask.run(Qu
estTimer.java:38)
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
        at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown Source)

        at java.util.concurrent.FutureTask.runAndReset(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
access$101(Unknown Source)
        at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.
runPeriodic(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)