npc buffer error

When I try to buff myself with the default NPC buffer of L2J I get this error in my console:

PHP Code:

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Failed running: [C] 21 RequestBypassToServer - L2J Server Version: 4299 - DP Rev
ision: 7511 ; javolution.util.FastList.shared()Ljavolution/util/FastList;
java.lang.NoSuchMethodError: javolution.util.FastList.shared()Ljavolution/util/F
astList;
        at com.l2jserver.gameserver.model.CharEffectList.addEffectFromQueue(Char
EffectList.java:745)
        at com.l2jserver.gameserver.model.CharEffectList.queueRunner(CharEffectL
ist.java:622)
        at com.l2jserver.gameserver.model.CharEffectList.queueEffect(CharEffectL
ist.java:592)
        at com.l2jserver.gameserver.model.actor.L2Character.addEffect(L2Characte
r.java:2690)
        at com.l2jserver.gameserver.model.L2Effect.startEffectTask(L2Effect.java
:383)
        at com.l2jserver.gameserver.model.L2Effect.scheduleEffect(L2Effect.java:
512)
        at com.l2jserver.gameserver.model.L2Skill.getEffects(L2Skill.java:2417)
        at com.l2jserver.gameserver.model.L2Skill.getEffects(L2Skill.java:2442)
        at com.l2jserver.gameserver.model.actor.instance.L2NpcBufferInstance.onB
ypassFeedback(L2NpcBufferInstance.java:147)
        at com.l2jserver.gameserver.network.clientpackets.RequestBypassToServer.
runImpl(RequestBypassToServer.java:143)
        at com.l2jserver.gameserver.network.clientpackets.L2GameClientPacket.run
(L2GameClientPacket.java:92)
        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) 


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try to update your source and dp

I downloaded the latest dp from l2jserver. How can I update it?

you can use the data folder and latest sqls. about core you need to compile the new version. read guides in tools section