pub fn show_error_dialog(title: &str, message: &str) {

    let dialog = ErrorDialog::new().unwrap();

    dialog.set_error_title(title.into());

    dialog.set_error_text(message.into());

    // Hide the dialog when the Ok button was pressed.

    {

        let weak_dialog = dialog.as_weak();

        dialog.on_ok_clicked(move || {

            if let Some(dialog) = &weak_dialog.upgrade() {

                dialog.hide().unwrap();

            }

        })

    }

    dialog.show().unwrap();

}