[TOY] hello.HelloDialogs throwing null pointer exceptions

The hello.HelloDialogs is throwing Null Pointer exceptions, I think because it is failing to find a resource here:

        dialogPane.setGraphic(new ImageView(new Image(AccordionSkin.class.getResource("modena/hello.dialog-error.png").toExternalForm())));

Seen with Exception Dialog, Font Dialog, Command Links, Linear Wizard, Branching Wizard

Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
at hello.dialog.dialogs.ExceptionDialog.<init>(ExceptionDialog.java:48)
at hello.HelloDialogs$5.handle(HelloDialogs.java:233)
at hello.HelloDialogs$5.handle(HelloDialogs.java:230)
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.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)


Seen on i.MX6