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JOptionPane: parentComponent does not have a valid parent
java.lang.RuntimeException: JOptionPane: parentComponent does not have a valid parent	at javax.swing.JOptionPane.createInternalFrame(JOptionPane.java:1161)	at javax.swing.JOptionPane.showInternalOptionDialog(JOptionPane.java:1025)	at javax.swing.JOptionPane.showInternalConfirmDialog(JOptionPane.java:967)	at javax.swing.JOptionPane.showInternalConfirmDialog(JOptionPane.java:931)