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Exception in Application start method
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Exception in Application start method
java.lang.NullPointerException: 	at org.jfree.chart.fx.ChartViewer.getUserAgentStylesheet(ChartViewer.java:124)	at com.sun.javafx.css.StyleManager.findMatchingStyles(StyleManager.java:1665)	at javafx.scene.CssStyleHelper.createStyleHelper(CssStyleHelper.java:111)	at javafx.scene.Node.reapplyCss(Node.java:8983)	at javafx.scene.Node.impl_reapplyCSS(Node.java:8946)	at javafx.scene.Node.invalidatedScenes(Node.java:854)	at javafx.scene.Node.setScenes(Node.java:919)	at javafx.scene.Scene$9.invalidated(Scene.java:1119)	at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:111)	at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:146)	at javafx.scene.Scene.setRoot(Scene.java:1072)	at javafx.scene.Scene.(Scene.java:347)	at javafx.scene.Scene.(Scene.java:194)	at org.jfree.chart.fx.demo.TimeSeriesChartFXDemo1.start(TimeSeriesChartFXDemo1.java:433)	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$163(LauncherImpl.java:863)	at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$176(PlatformImpl.java:326)	at com.sun.javafx.application.PlatformImpl.lambda$null$174(PlatformImpl.java:295)	at java.security.AccessController.doPrivileged(Native Method)	at com.sun.javafx.application.PlatformImpl.lambda$runLater$175(PlatformImpl.java:294)	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)	at com.sun.glass.ui.win.WinApplication.lambda$null$149(WinApplication.java:191)	at java.lang.Thread.run(Thread.java:745)