NiftyGUI sometimes throws an error when creating a Nifty object

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Sometimes, NiftyGUI throws an error when creating a nifty object (at the start 
of a game). However, this doesn't make the program crash or affect the gui's 
functionalities.

Original issue reported on code.google.com by destrostudios on 20 Jun 2014 at 10:08

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Original comment by destrostudios on 20 Jun 2014 at 10:09

• Added labels: Priority-Medium
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This is the error message:

org.bushe.swing.event.EventServiceExistsException: An event service by the name 
NiftyEventBusalready exists.  Perhaps multiple threads tried to create a 
service about the same time?
    at org.bushe.swing.event.EventServiceLocator.setEventService(EventServiceLocator.java:123)
    at de.lessvoid.nifty.Nifty.initalizeEventBus(Nifty.java:222)
    at de.lessvoid.nifty.Nifty.initialize(Nifty.java:202)
    at de.lessvoid.nifty.Nifty.<init>(Nifty.java:143)
    at com.jme3.niftygui.NiftyJmeDisplay.<init>(NiftyJmeDisplay.java:129)
    at amara.engine.appstates.NiftyAppState.createNifty(NiftyAppState.java:43)
    at amara.engine.applications.ingame.client.appstates.NiftyAppState_IngameClient.initialize(NiftyAppState_IngameClient.java:22)
    at com.jme3.app.state.AppStateManager.initializePending(AppStateManager.java:251)
    at com.jme3.app.state.AppStateManager.update(AppStateManager.java:281)
    at com.jme3.app.SimpleApplication.update(SimpleApplication.java:239)
    at com.jme3.system.lwjgl.LwjglAbstractDisplay.runLoop(LwjglAbstractDisplay.java:151)
    at com.jme3.system.lwjgl.LwjglDisplay.runLoop(LwjglDisplay.java:185)
    at com.jme3.system.lwjgl.LwjglAbstractDisplay.run(LwjglAbstractDisplay.java:228)
    at java.lang.Thread.run(Thread.java:744)

Original comment by destrostudios on 20 Jun 2014 at 10:11