I am trying to run this command python --mode MLE and got this error. I am not able to find the correct solution for it .

Traceback (most recent call last):
  File "", line 208, in <module>
  File "", line 94, in train_MLE
    encoder_input, decoder_input, weight = model.get_batch(d_valid, i)
  File "C:\Users\Kriti Gupta\Desktop\GitHub_repo\Seq2seq-Chatbot-With-Deep-Reinforcement-Learning\", line 342, in get_batch
    encoder_input, decoder_input = random.choice(data[bucket_id])
  File "C:\Users\Kriti Gupta\AppData\Local\Programs\Python\Python37\lib\", line 261, in choice
    raise IndexError('Cannot choose from an empty sequence') from None
IndexError: Cannot choose from an empty sequence