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

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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)

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