java.lang.NullPointerException
        at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:809)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:428)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69)
        at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1277)
        at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:242)
        at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:208)
        at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1235)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:428)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69)
        at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1277)
        at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:242)
        at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:208)
        at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1235)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:428)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69)
        at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1277)
        at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:242)
        at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:208)
        at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1235)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:428)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69)
        at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1277)
        at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:242)
        at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:208)
        at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1235)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:428)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69)
        at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1277)
        at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:242)
        at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:208)
        at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1235)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:428)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69)
        at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1277)
        at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:242)
        at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:208)
        at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1235)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:428)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69)
        at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1277)
        at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:242)
        at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:208)
        at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1235)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:428)
        at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:69)
        at com.sun.javafx.sg.BaseNode.render(BaseNode.java:1277)
        at com.sun.javafx.tk.quantum.ViewPainter.doPaint(ViewPainter.java:119)
        at com.sun.javafx.tk.quantum.AbstractPainter.paintImpl(AbstractPainter.java:221)
        at com.sun.javafx.tk.quantum.PresentingPainter.run(PresentingPainter.java:92)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
        at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
        at com.sun.prism.render.RenderJob.run(RenderJob.java:56)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
        at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:131)
        at java.lang.Thread.run(Thread.java:722)



I have no idea where to look .
Code can not provide. I can not understand where in this is