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java.lang.NullPointerException: 	at javax.swing.text.html.CSS$FontSize.getValue(CSS.java:1672)	at javax.swing.text.html.CSS$FontSize.toStyleConstants(CSS.java:1805)	at javax.swing.text.html.StyleSheet$ViewAttributeSet.getAttribute(StyleSheet.java:2630)	at javax.swing.text.StyleConstants.getFontSize(StyleConstants.java:358)	at javax.swing.text.html.CSS$FontSize.getValue(CSS.java:1678)	at javax.swing.text.html.CSS$FontSize.toStyleConstants(CSS.java:1805)	at javax.swing.text.html.StyleSheet$ViewAttributeSet.getAttribute(StyleSheet.java:2630)	at javax.swing.text.StyleConstants.getFontSize(StyleConstants.java:358)	at javax.swing.text.html.CSS$FontSize.getValue(CSS.java:1678)	at javax.swing.text.html.CSS.getFontSize(CSS.java:614)	at javax.swing.text.html.CSS.getFont(CSS.java:574)	at javax.swing.text.html.StyleSheet.getFont(StyleSheet.java:867)	at javax.swing.text.DefaultStyledDocument.getFont(DefaultStyledDocument.java:777)	at javax.swing.text.LabelView.setPropertiesFromAttributes(LabelView.java:128)	at javax.swing.text.html.InlineView.setPropertiesFromAttributes(InlineView.java:229)	at javax.swing.text.LabelView.sync(LabelView.java:39)	at javax.swing.text.LabelView.getFont(LabelView.java:189)	at javax.swing.text.GlyphPainter1.sync(GlyphPainter1.java:194)	at javax.swing.text.GlyphPainter1.getSpan(GlyphPainter1.java:42)	at javax.swing.text.GlyphView.getPreferredSpan(GlyphView.java:536)	at javax.swing.text.FlowView$LogicalView.getPreferredSpan(FlowView.java:692)	at javax.swing.text.FlowView.calculateMinorAxisRequirements(FlowView.java:216)	at javax.swing.text.html.ParagraphView.calculateMinorAxisRequirements(ParagraphView.java:128)	at javax.swing.text.BoxView.checkRequests(BoxView.java:911)	at javax.swing.text.BoxView.getMinimumSpan(BoxView.java:542)	at javax.swing.text.html.ParagraphView.getMinimumSpan(ParagraphView.java:257)	at javax.swing.text.BoxView.calculateMinorAxisRequirements(BoxView.java:879)	at javax.swing.text.html.BlockView.calculateMinorAxisRequirements(BlockView.java:129)	at javax.swing.text.BoxView.checkRequests(BoxView.java:911)	at javax.swing.text.BoxView.getMinimumSpan(BoxView.java:542)	at javax.swing.text.html.BlockView.getMinimumSpan(BlockView.java:362)	at javax.swing.text.BoxView.calculateMinorAxisRequirements(BoxView.java:879)	at javax.swing.text.html.BlockView.calculateMinorAxisRequirements(BlockView.java:129)	at javax.swing.text.BoxView.checkRequests(BoxView.java:911)	at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:325)	at javax.swing.text.BoxView.layout(BoxView.java:682)	at javax.swing.text.BoxView.setSize(BoxView.java:379)	at javax.swing.plaf.basic.BasicTextUI$RootView.setSize(BasicTextUI.java:1631)	at javax.swing.plaf.basic.BasicTextUI.getPreferredSize(BasicTextUI.java:830)	at javax.swing.JComponent.getPreferredSize(JComponent.java:1582)	at javax.swing.JEditorPane.getPreferredSize(JEditorPane.java:1227)	at javax.swing.text.JTextComponent.getPreferredScrollableViewportSize(JTextComponent.java:1712)	at javax.swing.ViewportLayout.preferredLayoutSize(ViewportLayout.java:75)	at java.awt.Container.preferredSize(Container.java:1558)	at java.awt.Container.getPreferredSize(Container.java:1543)	at javax.swing.JComponent.getPreferredSize(JComponent.java:1584)	at javax.swing.ScrollPaneLayout.preferredLayoutSize(ScrollPaneLayout.java:475)	at java.awt.Container.preferredSize(Container.java:1558)	at java.awt.Container.getPreferredSize(Container.java:1543)	at javax.swing.JComponent.getPreferredSize(JComponent.java:1584)	at com.izforge.izpack.gui.IzPanelLayout.rowHeight(Unknown Source)	at com.izforge.izpack.gui.IzPanelLayout.layoutContainer(Unknown Source)	at java.awt.Container.layout(Container.java:1401)	at java.awt.Container.doLayout(Container.java:1390)	at java.awt.Container.validateTree(Container.java:1473)	at java.awt.Container.validateTree(Container.java:1480)	at java.awt.Container.validateTree(Container.java:1480)	at java.awt.Container.validateTree(Container.java:1480)	at java.awt.Container.validateTree(Container.java:1480)	at java.awt.Container.validate(Container.java:1448)	at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:379)	at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:113)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)	at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)