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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 java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)	at com.sun.javafx.tk.RenderJob.run(RenderJob.java:58)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:125)	at java.lang.Thread.run(Thread.java:745)