TypeError: Error #1009: Cannot access a property or method of a null object reference.
	at views.windows.tutorial::TutorialMediator/ready()
	at WindowBaseMediator/localizationReady()
	at org.puremvc.as3.multicore.patterns.mediator::Mediator/callWithProxy()
	at WindowBaseMediator/screenCompositionReady()
	at Function/http://adobe.com/AS3/2006/builtin::apply()
	at Dispatcher/dispatch()
	at common.handlers::Progress/finishProcess()
	at render.controller.getTextureGroup::CreateTextureDefinitionCommand/execute()
	at org.puremvc.as3.multicore.core::Controller/executeCommand()
	at org.puremvc.as3.multicore.core::Controller/executeCommands()
	at org.puremvc.as3.multicore.patterns.observer::Observer/notifyObserver()
	at org.puremvc.as3.multicore.core::View/notifyObserver()
	at org.puremvc.as3.multicore.core::View/notifyObservers()
	at org.puremvc.as3.multicore.patterns.facade::Facade/sendNotification()
	at global/render::getView()
	at WindowBaseMediator/onConfigLoaded()
	at Function/http://adobe.com/AS3/2006/builtin::apply()
	at Dispatcher/dispatch()
	at common.handlers::Progress/finishProcess()
	at data.loading::ContentRequestCommand/finish()
	at data.loading::ContentRequestCommand/loadingRequest()
	at data.loading::ContentRequestCommand/execute()
	at org.puremvc.as3.multicore.core::Controller/executeCommand()
	at org.puremvc.as3.multicore.core::Controller/executeCommands()
	at org.puremvc.as3.multicore.patterns.observer::Observer/notifyObserver()
	at org.puremvc.as3.multicore.core::View/notifyObserver()
	at org.puremvc.as3.multicore.core::View/notifyObservers()
	at org.puremvc.as3.multicore.patterns.facade::Facade/sendNotification()
	at Sample$/requestContent()
	at WindowBaseMediator/onRegister()
	at org.puremvc.as3.multicore.patterns.mediator::Mediator/internalOnRegister()
	at org.puremvc.as3.multicore.core::View/registerMediator()
	at org.puremvc.as3.multicore.patterns.facade::Facade/registerMediator()
	at ShowTutorialAfter/execute()
	at org.puremvc.as3.multicore.core::Controller/executeCommand()
	at org.puremvc.as3.multicore.core::Controller/executeCommands()
	at org.puremvc.as3.multicore.patterns.observer::Observer/notifyObserver()
	at org.puremvc.as3.multicore.core::View/notifyObserver()
	at lists::LinkedList/forEach()
	at org.puremvc.as3.multicore.core::View/notifyObservers()
	at org.puremvc.as3.multicore.patterns.facade::Facade/sendNotification()
	at WindowBaseMediator/internalClose()
	at views.windows.tutorial::TutorialMediator/closing()
	at WindowBaseMediator/windowsSpace::startCloseProcess()
	at WindowBaseMediator/close()
	at views.windows.tutorial::TutorialMediator/onEpisodeClick()
	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()