Android Thread ProgressDialog Error

public class UpdateDBProgressDialog extends Activity implements Runnable {

    private TextView tv;
    private ProgressDialog pd;
    private RatedCallsService rcs = new RatedCallsService();

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        pd = ProgressDialog.show(this, "Updating Database", "The application is updating the database. Please wait.", true, false);
        Thread thread = new Thread(this);
        thread.start();
    }

    public void run() {
        rcs.updateDB();
        handler.sendEmptyMessage(0);
    }

    private Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            pd.dismiss();
        }
    };
}