You don't have 'rfileTr' as an argument in your ArgumentParser. It seems that you have used 'rTr' instead of 'rfileTr'.
Change
parser.add_argument('--rTr', required=True, help='R classification results file for training data')
to
parser.add_argument('--rfileTr', required=True, help='R classification results file for training data')
This should fix the error.