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

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java.lang.NullPointerException:
at javax.swing.text.FlowView$FlowStrategy.createView(FlowView.java:610)
at javax.swing.text.FlowView$FlowStrategy.layoutRow(FlowView.java:452)
at javax.swing.text.FlowView$FlowStrategy.layout(FlowView.java:408)
at javax.swing.text.FlowView.layout(FlowView.java:182)
at javax.swing.text.BoxView.setSize(BoxView.java:379)
at javax.swing.text.BoxView.updateChildSizes(BoxView.java:348)
at javax.swing.text.BoxView.setSpanOnAxis(BoxView.java:330)
at javax.swing.text.BoxView.layout(BoxView.java:682)
at javax.swing.text.BoxView.setSize(BoxView.java:379)
at javax.swing.plaf.basic.BasicTextUI$RootView.setSize(BasicTextUI.java:1599)
at javax.swing.plaf.basic.BasicTextUI.getPreferredSize(BasicTextUI.java:801)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1275)
at javax.swing.JEditorPane.getPreferredSize(JEditorPane.java:1212)
at java.awt.BorderLayout.preferredLayoutSize(BorderLayout.java:572)
at java.awt.Container.preferredSize(Container.java:1178)
at java.awt.Container.getPreferredSize(Container.java:1162)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1277)
at javax.swing.ScrollPaneLayout.layoutContainer(ScrollPaneLayout.java:769)
at java.awt.Container.layout(Container.java:1020)
at java.awt.Container.doLayout(Container.java:1010)
at java.awt.Container.validateTree(Container.java:1092)
at java.awt.Container.validate(Container.java:1067)
at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:353)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:116)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:178)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:454)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)

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