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java.lang.NullPointerException: 	at com.sun.javafx.tk.quantum.QuantumToolkit.isSupported(QuantumToolkit.java:1146)	at com.sun.javafx.application.PlatformImpl.isSupportedImpl(PlatformImpl.java:809)	at com.sun.javafx.application.PlatformImpl.isSupported(PlatformImpl.java:482)	at javafx.application.Platform.isSupported(Platform.java:168)	at com.sun.javafx.scene.input.PickResultChooser.processOffer(PickResultChooser.java:182)	at com.sun.javafx.scene.input.PickResultChooser.offer(PickResultChooser.java:143)	at javafx.scene.Node.impl_intersects(Node.java:4943)	at javafx.scene.layout.Region.impl_pickNodeLocal(Region.java:2942)	at javafx.scene.Node.impl_pickNode(Node.java:4912)	at javafx.scene.layout.Region.impl_pickNodeLocal(Region.java:2936)	at javafx.scene.Node.impl_pickNode(Node.java:4912)	at javafx.scene.layout.Region.impl_pickNodeLocal(Region.java:2936)	at javafx.scene.Node.impl_pickNode(Node.java:4912)	at javafx.scene.layout.Region.impl_pickNodeLocal(Region.java:2936)	at javafx.scene.Node.impl_pickNode(Node.java:4912)	at javafx.scene.layout.Region.impl_pickNodeLocal(Region.java:2936)	at javafx.scene.Node.impl_pickNode(Node.java:4912)	at javafx.scene.Scene$MouseHandler.pickNode(Scene.java:3899)	at javafx.scene.Scene$MouseHandler.access$1600(Scene.java:3485)	at javafx.scene.Scene.pick(Scene.java:1942)	at javafx.scene.Scene.access$6700(Scene.java:159)	at javafx.scene.Scene$MouseHandler.process(Scene.java:3799)	at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)	at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)	at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:380)	at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:294)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:416)	at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)	at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:415)	at com.sun.glass.ui.View.handleMouseEvent(View.java:555)	at com.sun.glass.ui.View.notifyMouse(View.java:937)	at com.sun.glass.ui.monocle.MonocleView.notifyMouse(MonocleView.java:118)	at com.sun.glass.ui.monocle.input.MouseInput.notifyMouse(MouseInput.java:309)	at com.sun.glass.ui.monocle.input.MouseInput.lambda$postMouseEvent$22(MouseInput.java:222)	at com.sun.glass.ui.monocle.RunnableProcessor.runLoop(RunnableProcessor.java:77)	at com.sun.glass.ui.monocle.RunnableProcessor.enterNestedEventLoop(RunnableProcessor.java:92)	at com.sun.glass.ui.monocle.MonocleApplication._enterNestedEventLoop(MonocleApplication.java:148)	at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:511)	at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107)	at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:583)	at javafx.stage.Stage.showAndWait(Stage.java:474)	at address.controller.MainController.showTagList(MainController.java:425)	at address.controller.RootLayoutController.handleShowTags(RootLayoutController.java:161)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)	at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)	at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1771)	at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)	at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)	at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)	at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)	at javafx.event.Event.fireEvent(Event.java:198)	at javafx.scene.control.MenuItem.fire(MenuItem.java:462)	at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.doSelect(ContextMenuContent.java:1405)	at com.sun.javafx.scene.control.skin.ContextMenuContent$MenuItemContainer.lambda$createChildren$343(ContextMenuContent.java:1358)	at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)	at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)	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.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)	at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)	at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)