Emulator_errors_stacktrace

How can I resolve this error?
java.lang.reflect.InvocationTargetException
    at sun.reflect.GeneratedConstructorAccessor28.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
    at java.lang.reflect.Constructor.newInstance(Unknown Source)
    at com.eu.habbo.habbohotel.items.ItemManager.loadHabboItem(ItemManager.java:849)
    at com.eu.habbo.habbohotel.users.inventory.ItemsComponent.loadItems(ItemsComponent.java:51)
    at com.eu.habbo.habbohotel.users.inventory.ItemsComponent.<init>(ItemsComponent.java:34)
    at com.eu.habbo.habbohotel.users.HabboInventory.<init>(HabboInventory.java:57)
    at com.eu.habbo.habbohotel.users.Habbo.<init>(Habbo.java:52)
    at com.eu.habbo.habbohotel.users.HabboManager.loadHabbo(HabboManager.java:132)
    at com.eu.habbo.messages.incoming.handshake.SecureLoginEvent.handle(SecureLoginEvent.java:69)
    at com.eu.habbo.messages.PacketManager.handlePacket(PacketManager.java:212)
    at com.eu.habbo.threading.runnables.ChannelReadHandler.run(ChannelReadHandler.java:44)
    at com.eu.habbo.threading.ThreadPooling$1.run(ThreadPooling.java:54)
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(Unknown Source)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NumberFormatException: For input string: ""
    at java.lang.NumberFormatException.forInputString(Unknown Source)
    at java.lang.Integer.parseInt(Unknown Source)
    at java.lang.Integer.valueOf(Unknown Source)
    at com.eu.habbo.habbohotel.items.interactions.InteractionMusicDisc.<init>(InteractionMusicDisc.java:26)
    ... 21 more
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