I have no strict sequence of steps to reproduce but I've got it sometimes while removing ImageView without setting up the URL


you'll got following exception:
Exception in thread "JavaFX Application Thread" java.lang.IllegalStateException: Bug in FXOMRefresher
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMRefresher.refresh(FXOMRefresher.java:57)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMDocument.refreshSceneGraph(FXOMDocument.java:208)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMDocument.endUpdate(FXOMDocument.java:195)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMDocument.setFxomRoot(FXOMDocument.java:122)
at com.oracle.javafx.scenebuilder.kit.metadata.util.ClipboardDecoder.makeFxomDocumentFromImageURL(ClipboardDecoder.java:188)
at com.oracle.javafx.scenebuilder.kit.metadata.util.ClipboardDecoder.makeFxomDocumentFromImageURL(ClipboardDecoder.java:153)
at com.oracle.javafx.scenebuilder.kit.metadata.util.ClipboardDecoder.decode(ClipboardDecoder.java:111)
at com.oracle.javafx.scenebuilder.kit.editor.job.PasteJob.buildSubJobs(PasteJob.java:152)
at com.oracle.javafx.scenebuilder.kit.editor.job.PasteJob.<init>(PasteJob.java:58)
at com.oracle.javafx.scenebuilder.kit.editor.EditorController.canPerformEditAction(EditorController.java:882)
at com.oracle.javafx.scenebuilder.app.menubar.MenuBarController$EditActionController.canPerform(MenuBarController.java:1003)
at com.oracle.javafx.scenebuilder.app.menubar.MenuBarController.handleOnMenuValidation(MenuBarController.java:699)
at com.oracle.javafx.scenebuilder.app.menubar.MenuBarController.access$200(MenuBarController.java:79)
at com.oracle.javafx.scenebuilder.app.menubar.MenuBarController$8.handle(MenuBarController.java:689)
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:203)
at com.sun.javafx.scene.control.skin.MenuButtonSkinBase$5.run(MenuButtonSkinBase.java:310)
at com.sun.javafx.scene.KeyboardShortcutsHandler.processAccelerators(KeyboardShortcutsHandler.java:350)
at com.sun.javafx.scene.KeyboardShortcutsHandler.dispatchBubblingEvent(KeyboardShortcutsHandler.java:168)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:203)
at javafx.scene.Scene$KeyHandler.process(Scene.java:3862)
at javafx.scene.Scene$KeyHandler.access$2100(Scene.java:3809)
at javafx.scene.Scene.impl_processKeyEvent(Scene.java:1993)
at javafx.scene.Scene$ScenePeerListener.keyEvent(Scene.java:2450)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(GlassViewEventHandler.java:170)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$KeyEventNotification.run(GlassViewEventHandler.java:123)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleKeyEvent(GlassViewEventHandler.java:197)
at com.sun.glass.ui.View.handleKeyEvent(View.java:517)
at com.sun.glass.ui.View.notifyKey(View.java:927)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$300(WinApplication.java:39)
at com.sun.glass.ui.win.WinApplication$4$1.run(WinApplication.java:112)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.io.IOException: javafx.fxml.LoadException:
unknown path:9

at com.oracle.javafx.scenebuilder.kit.fxom.FXOMLoader.load(FXOMLoader.java:84)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMDocument.<init>(FXOMDocument.java:71)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMRefresher.refresh(FXOMRefresher.java:54)
... 46 more
Caused by: javafx.fxml.LoadException:
unknown path:9

at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2589)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2567)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:2397)
at com.oracle.javafx.scenebuilder.kit.fxom.FXOMLoader.load(FXOMLoader.java:81)
... 48 more
Caused by: java.lang.IllegalArgumentException: URL must not be empty
at javafx.scene.image.Image.validateUrl(Image.java:1073)
at javafx.scene.image.Image.<init>(Image.java:671)
at com.sun.javafx.fxml.builder.JavaFXImageBuilder.build(JavaFXImageBuilder.java:47)
at com.sun.javafx.fxml.builder.JavaFXImageBuilder.build(JavaFXImageBuilder.java:37)
at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:752)
at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2811)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2504)
... 50 more
Beep... :(