Getting "UnboundLocalError: local variable 'cell_fn' referenced before assignment"

[IronCraftMan]

Running it using anaconda on Windows. The full error is:

Traceback (most recent call last):
  File "train.py", line 379, in <module>
    main()
  File "train.py", line 249, in main
    train_model = CharRNN(is_training=True, use_batch=True, **params)
  File "H:\Development\ML\tensorflow-char-rnn\char_rnn_model.py", line 68, in __init__
    cell = cell_fn(
UnboundLocalError: local variable 'cell_fn' referenced before assignment

I'm not a python programmer, so I have no clue as to how to solve this error.