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java.awt.HeadlessException: null	at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:207)	at java.awt.Window.(Window.java:535)	at java.awt.Frame.(Frame.java:420)	at java.awt.Frame.(Frame.java:385)	at javax.swing.SwingUtilities$SharedOwnerFrame.(SwingUtilities.java:1756)	at javax.swing.SwingUtilities.getSharedOwnerFrame(SwingUtilities.java:1831)	at javax.swing.JOptionPane.getRootFrame(JOptionPane.java:1697)	at javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:863)	at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:667)	at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:638)	at org.multibit.hd.core.error_reporting.ExceptionHandler$1.run(ExceptionHandler.java:112)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:745)	at java.awt.EventQueue.access$300(EventQueue.java:103)	at java.awt.EventQueue$3.run(EventQueue.java:706)	at java.awt.EventQueue$3.run(EventQueue.java:704)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:715)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)