+ u,
+ u + "\n" + ex.getMessage(),
  protected void setBaseInstancesFromURL(URL u) {    try {      m_Log.statusMessage("Reading from URL...");      Reader r = new BufferedReader(new InputStreamReader(u.openStream()));      setBaseInstances(new Instances(r));      r.close();    } catch (Exception ex) {      m_Log.statusMessage("Problem reading " + u);      JOptionPane.showMessageDialog(this,				    "Couldn't read from URL:\n"				    + u,				    "Load Instances",				    JOptionPane.ERROR_MESSAGE);    }  }