java.lang.NullPointerException: Attempt to invoke virtual method 'void io.datafx.controller.flow.context.FlowActionHandler.navigate(java.lang.Class)' on a null object reference

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Attempt to invoke virtual method 'void io.datafx.controller.flow.context.FlowActionHandler.navigate(java.lang.Class)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'void io.datafx.controller.flow.context.FlowActionHandler.navigate(java.lang.Class)' on a null object reference
at com.nsc.LoginSceneFXMLController.lambda$authenticateUser$1(LoginSceneFXMLController.java:102)
at com.nsc.LoginSceneFXMLController.access$lambda$1(LoginSceneFXMLController.java)
at com.nsc.LoginSceneFXMLController$$Lambda$4.handle(Unknown Source)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.concurrent.EventHelper.fireEvent(EventHelper.java:219)
at javafx.concurrent.Service.fireEvent(Service.java:853)
at javafx.concurrent.Service.lambda$new$471(Service.java:538)
at javafx.concurrent.Service$$Lambda$1.changed(Unknown Source)
at com.sun.javafx.binding.ExpressionHelper$SingleChange.fireValueChangedEvent(ExpressionHelper.java:182)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
at javafx.beans.property.ObjectPropertyBase.access$000(ObjectPropertyBase.java:51)
at javafx.beans.property.ObjectPropertyBase$Listener.invalidated(ObjectPropertyBase.java:233)
at com.sun.javafx.binding.ExpressionHelper$SingleInvalidation.fireValueChangedEvent(ExpressionHelper.java:137)
at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:81)
at javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:105)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:112)
at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)
at javafx.concurrent.Task.setState(Task.java:696)
at javafx.concurrent.Task$TaskCallable.lambda$call$482(Task.java:1453)
at javafx.concurrent.Task$TaskCallable$$Lambda$3.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$155(PlatformImpl.java:295)
at com.sun.javafx.application.PlatformImpl$$Lambda$19.run(Unknown Source)
at java.security.AccessController.doPrivileged(AccessController.java:52)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$156(PlatformImpl.java:294)
at com.sun.javafx.application.PlatformImpl$$Lambda$6.run(Unknown Source)
at com.sun.glass.ui.monocle.RunnableProcessor.runLoop(RunnableProcessor.java:92)
at com.sun.glass.ui.monocle.RunnableProcessor.run(RunnableProcessor.java:51)
at java.lang.Thread.run(Thread.java:818)

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