Error creating new instance of Class class net.sf.l2j.gameserver.skills.EffectBuff
java.lang.reflect.InvocationTargetException
        at sun.reflect.GeneratedConstructorAccessor30.newInstance(Unknown Source)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
        at java.lang.reflect.Constructor.newInstance(Unknown Source)
        at net.sf.l2j.gameserver.skills.EffectTemplate.getEffect(EffectTemplate.java:80)
        at net.sf.l2j.gameserver.model.L2Skill.getEffects(L2Skill.java:1269)
        at net.sf.l2j.gameserver.handler.skillhandlers.Continuous.useSkill(Continuous.java:94)
        at net.sf.l2j.gameserver.model.L2Character.callSkill(L2Character.java:5121)
        at net.sf.l2j.gameserver.model.L2PcInstance.restoreEffects(L2PcInstance.java:4681)
        at net.sf.l2j.gameserver.clientpackets.EnterWorld.runImpl(EnterWorld.java:90)
        at net.sf.l2j.gameserver.clientpackets.ClientBasePacket.run(ClientBasePacket.java:56)
        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)
Caused by: java.lang.NullPointerException
        at net.sf.l2j.gameserver.model.L2Character.addEffect(L2Character.java:5263)
        at net.sf.l2j.gameserver.model.L2Effect.startEffectTask(L2Effect.java:253)
        at net.sf.l2j.gameserver.model.L2Effect.scheduleEffect(L2Effect.java:367)
        at net.sf.l2j.gameserver.model.L2Effect.<init>(L2Effect.java:168)
        at net.sf.l2j.gameserver.skills.EffectBuff.<init>(EffectBuff.java:33)
        ... 18 more