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java.awt.HeadlessException at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:121) at java.awt.Window.<init>(Window.java:274) at java.awt.Frame.<init>(Frame.java:401) at java.awt.Frame.<init>(Frame.java:366) at javax.swing.SwingUtilities$1.<init>(SwingUtilities.java:1641)