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Class changer popup


King1
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Hey I get this error everytime the class changer popup happens in my server and it says null and don't show anything.

[18:14:48] ERROR Quest Error!
java.lang.NullPointerException
        at l2ro.gameserver.cache.ImagesCache.sendUsedImages(ImagesCache.java:225)
        at l2ro.gameserver.model.quest.QuestState.showTutorialHTML(QuestState.java:837)
        at quests._255_Tutorial.checkClassMaster(_255_Tutorial.java:1476)
        at quests._255_Tutorial.onEvent(_255_Tutorial.java:455)
        at l2ro.gameserver.model.quest.Quest.notifyEvent(Quest.java:604)
        at l2ro.gameserver.model.Player.processQuestEvent(Player.java:1468)
        at l2ro.gameserver.network.clientpackets.RequestTutorialPassCmdToServer.runImpl(RequestTutorialPassCmdToServer.java:94)
        at l2ro.gameserver.network.clientpackets.L2GameClientPacket.run(L2GameClientPacket.java:49)
        at l2ro.commons.net.nio.impl.MMOExecutableQueue.run(MMOExecutableQueue.java:39)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)

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