Error: Cannot remove a screen while it is transitioning in or out.
	at feathers.controls.supportClasses::BaseScreenNavigator/removeScreenInternal()
	at feathers.controls::ScreenNavigator/removeScreen()
	at controller.mediator::WindowsMediator/startCloseWindow()
	at controller.mediator::WindowsMediator/onReceivedCloseNotification()
	at Function/http://adobe.com/AS3/2006/builtin::call()
	at org.puremvc.as3.multicore.patterns.mediator::Mediator/handleNotification()
	at Function/http://adobe.com/AS3/2006/builtin::apply()
	at org.puremvc.as3.multicore.patterns.observer::Observer/notifyObserver()
	at org.puremvc.as3.multicore.core::View/notifyObservers()
	at org.puremvc.as3.multicore.patterns.facade::Facade/notifyObservers()
	at org.puremvc.as3.multicore.patterns.facade::FacadeWithJunctions/sendNotification()
	at org.puremvc.as3.multicore.patterns.observer::Notifier/sendNotification()
	at controller.mediator::BaseWindowMediator/closeWindow()
	at controller.mediator::BaseWindowMediator/onCloseClick()
	at view.windows::MissionsWindow/redrawElements()
	at view.windows::MissionsWindow/setData()
	at controller.mediator::MissionsWindowMediator/onWindowStartsShow()
	at controller.mediator::WindowsMediator/showCurrentWindow()
	at controller.mediator::WindowsMediator/showWindow()
	at controller.mediator::WindowsMediator/onWindowOpen()
	at Function/http://adobe.com/AS3/2006/builtin::call()
	at org.puremvc.as3.multicore.patterns.mediator::Mediator/handleNotification()
	at Function/http://adobe.com/AS3/2006/builtin::apply()
	at org.puremvc.as3.multicore.patterns.observer::Observer/notifyObserver()
	at org.puremvc.as3.multicore.core::View/notifyObservers()
	at org.puremvc.as3.multicore.patterns.facade::Facade/notifyObservers()
	at org.puremvc.as3.multicore.patterns.facade::Facade/sendTypedNotification()
	at org.puremvc.as3.multicore.patterns.observer::Notifier/sendTypedNotification()
	at controller.mediator::MainInterfaceMediator/onMissionClick()
	at org.osflash.signals::Signal/dispatch()
	at view.windows.elements::MITopPanelElements/onMissionClick()
	at org.osflash.signals::Signal/dispatch()
	at LeftPanelBlock/onMissionClick()
	at starling.events::EventDispatcher/invokeEvent()
	at starling.events::EventDispatcher/dispatchEvent()
	at starling.display::DisplayObject/dispatchEvent()
	at starling.events::EventDispatcher/dispatchEventWith()
	at feathers.utils.touch::TapToTrigger/target_touchHandler()
	at starling.events::EventDispatcher/invokeEvent()
	at starling.events::TouchEvent/dispatch()
	at starling.events::Touch/dispatchEvent()
	at starling.events::TouchProcessor/processTouches()
	at starling.events::TouchProcessor/advanceTime()
	at starling.core::Starling/advanceTime()
	at starling.core::Starling/nextFrame()
	at starling.core::Starling/onEnterFrame()