I was able to generate the same error on my Ubuntu 9.xx version.
However, I changed the code little bit under
<Application_Name>View.java. It creates a piece of code by default for
about box:


public void showAboutBox() {
    if (aboutBox == null) {
        JFrame mainFrame =  
<Application_Name>App.getApplication().getMainFrame();
        aboutBox = new  <Application_Name>AboutBox(mainFrame);
        aboutBox.setLocationRelativeTo(mainFrame);    
    }
    <Application_Name>App.getApplication().show(aboutBox);
}
I changed this code as follows to rectify the error:

public void showAboutBox() {
        JFrame mainFrame = 
<Application_Name>App.getApplication().getMainFrame();
        aboutBox = new  <Application_Name>AboutBox(mainFrame);
        aboutBox.setLocationRelativeTo(mainFrame);    
        aboutBox.setVisible(true);  
}

-- 
netbeans sample application dispose()
https://bugs.launchpad.net/bugs/308826
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