java.lang.NullPointerException: This exception has no message.

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This exception has no message.
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This exception has no message.
java.lang.NullPointerException:
at com.sun.javafx.sg.prism.NGCanvas$RenderBuf.validate(NGCanvas.java:213)
at com.sun.javafx.sg.prism.NGCanvas.initCanvas(NGCanvas.java:640)
at com.sun.javafx.sg.prism.NGCanvas.renderContent(NGCanvas.java:603)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
at com.sun.javafx.sg.prism.NGNode.renderForClip(NGNode.java:2294)
at com.sun.javafx.sg.prism.NGNode.renderRectClip(NGNode.java:2188)
at com.sun.javafx.sg.prism.NGNode.renderClip(NGNode.java:2214)
at com.sun.javafx.sg.prism.CacheFilter.impl_renderNodeToCache(CacheFilter.java:671)
at com.sun.javafx.sg.prism.CacheFilter.render(CacheFilter.java:575)
at com.sun.javafx.sg.prism.NGNode.renderCached(NGNode.java:2358)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2044)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:576)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
at com.sun.javafx.tk.quantum.ViewPainter.doPaint(ViewPainter.java:477)
at com.sun.javafx.tk.quantum.ViewPainter.paintImpl(ViewPainter.java:323)
at com.sun.javafx.tk.quantum.PresentingPainter.run(PresentingPainter.java:91)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at com.sun.javafx.tk.RenderJob.run(RenderJob.java:58)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:125)
at java.lang.Thread.run(Thread.java:745)

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