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java.lang.Error: can't load com.sun.java.swing.plaf.gtk.GTKLookAndFeel at javax.swing.UIManager.initializeDefaultLAF(Unknown Source) at javax.swing.UIManager.initialize(Unknown Source) at javax.swing.UIManager.maybeInitialize(Unknown Source) at javax.swing.UIManager.getDefaults(Unknown Source) at javax.swing.UIManager.put(Unknown Source) at MyForm.main(MyForm.java:99)