Instructions? (what did I do wrong)

[keflavich]

In [4]: import busfactor.counter

In [5]: busfactor.counter.main()
Traceback (most recent call last):
  File "<ipython-input-5-47fbe6727986>", line 1, in <module>
    busfactor.counter.main()
  File "/Users/adam/repos/busfactor/busfactor/counter.py", line 93, in main
    for e in ['py', 'f', 'c', 'h', 'pyx']])
  File "/Users/adam/repos/busfactor/busfactor/counter.py", line 93, in <listcomp>
    for e in ['py', 'f', 'c', 'h', 'pyx']])
IndexError: list index out of range