"Problem with file:\n" + ex.getMessage(),
"Couldn't read from file:\n" + f.getName(),
  protected void setInstancesFromFile(File f) {          try {      Reader r = new BufferedReader(new FileReader(f));      setInstances(new Instances(r));      r.close();    } catch (Exception ex) {      JOptionPane.showMessageDialog(this,				    "Problem with file:\n"				    + ex.getMessage(),				    "Load Instances",				    JOptionPane.ERROR_MESSAGE);    }  }