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java.lang.NullPointerException: 	at sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1264)	at sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:219)	at sun.awt.FontConfiguration.init(FontConfiguration.java:107)	at sun.awt.X11FontManager.createFontConfiguration(X11FontManager.java:774)	at sun.font.SunFontManager$2.run(SunFontManager.java:431)	at java.security.AccessController.doPrivileged(Native Method)	at sun.font.SunFontManager.(SunFontManager.java:376)	at sun.awt.FcFontManager.(FcFontManager.java:35)	at sun.awt.X11FontManager.(X11FontManager.java:57)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)	at java.lang.Class.newInstance(Class.java:442)	at sun.font.FontManagerFactory$1.run(FontManagerFactory.java:83)	at java.security.AccessController.doPrivileged(Native Method)	at sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:74)	at sun.font.SunFontManager.getInstance(SunFontManager.java:250)	at sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:264)	at sun.swing.SwingUtilities2.getFontMetrics(SwingUtilities2.java:1113)	at javax.swing.JComponent.getFontMetrics(JComponent.java:1626)	at javax.swing.text.PlainView.calculateLongestLine(PlainView.java:639)	at javax.swing.text.PlainView.updateMetrics(PlainView.java:209)	at javax.swing.text.PlainView.updateDamage(PlainView.java:527)	at javax.swing.text.PlainView.insertUpdate(PlainView.java:451)	at javax.swing.text.FieldView.insertUpdate(FieldView.java:293)	at javax.swing.plaf.basic.BasicTextUI$RootView.insertUpdate(BasicTextUI.java:1610)	at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.insertUpdate(BasicTextUI.java:1869)	at javax.swing.text.AbstractDocument.fireInsertUpdate(AbstractDocument.java:201)	at javax.swing.text.AbstractDocument.handleInsertString(AbstractDocument.java:748)	at javax.swing.text.AbstractDocument.insertString(AbstractDocument.java:707)	at javax.swing.text.PlainDocument.insertString(PlainDocument.java:130)	at javax.swing.text.AbstractDocument.replace(AbstractDocument.java:669)	at javax.swing.text.JTextComponent.setText(JTextComponent.java:1669)	at javax.swing.JFormattedTextField$AbstractFormatter.install(JFormattedTextField.java:948)	at javax.swing.text.DefaultFormatter.install(DefaultFormatter.java:125)	at javax.swing.text.InternationalFormatter.install(InternationalFormatter.java:285)	at javax.swing.JFormattedTextField.setFormatter(JFormattedTextField.java:464)	at javax.swing.JFormattedTextField.setValue(JFormattedTextField.java:788)	at javax.swing.JFormattedTextField.setValue(JFormattedTextField.java:501)	at es.estoes.wallpaperDownloader.window.WallpaperDownloader.initializeGUI(WallpaperDownloader.java:814)	at es.estoes.wallpaperDownloader.window.WallpaperDownloader.initialize(WallpaperDownloader.java:426)	at es.estoes.wallpaperDownloader.window.WallpaperDownloader.(WallpaperDownloader.java:160)	at es.estoes.wallpaperDownloader.window.WallpaperDownloader$1.run(WallpaperDownloader.java:149)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:726)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)