illegal component position

I have a detail in my application, I have a menu in which is called a JInternalFrame, and something curious happens, when I call it the first time it appears, when I close it with the dispose () function, but ... when I repeat this operation, the third time it generates an exception that says:

Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: illegal component position

The block of code that I do the previous procedure is the following:

mntmSesion = new JMenuItem("Sesion");
    mntmSesion.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {
            if(mntmSesion.getText().equals("Cerrar Sesion")) {
                System.out.println("Cerrando sesion");
                operDB.eliminarTabla("sesionActiva");

                p2.dispose();
                p3.dispose();
                p4.dispose();
                p5.dispose();
                p6.dispose();
                p7.dispose();
                pgarrafon.dispose();
            }else {

                desktopPane.add(p1);
            p1.setBounds(0, 0, desktopPane.getWidth(), desktopPane.getHeight());
            p1.show();

                }

            }

    });
    mnInicio.add(mntmSesion);

After the exception, if I click, if I show the JInternalFrame