Traceback information is provided below:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/coalib/bears/Bear.py", line 282, in execute
    return [] if result is None else list(result)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/bears/vcs/git/GitCommitBear.py", line 129, in run
    **self.get_shortlog_checks_metadata().filter_parameters(kwargs))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/bears/vcs/git/GitCommitBear.py", line 185, in check_shortlog
    has_flaws = self.check_imperative(shortlog)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/bears/vcs/git/GitCommitBear.py", line 208, in check_imperative
    words = nltk.word_tokenize(nltk.sent_tokenize(paragraph)[0])
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/nltk/tokenize/__init__.py", line 94, in sent_tokenize
    tokenizer = load('tokenizers/punkt/{0}.pickle'.format(language))
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/nltk/data.py", line 834, in load
    opened_resource = _open(resource_url)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/nltk/data.py", line 952, in _open
    return find(path_, path + ['']).open()
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/nltk/data.py", line 673, in find
    raise LookupError(resource_not_found)
LookupError:
**********************************************************************
  Resource punkt not found.
  Please use the NLTK Downloader to obtain the resource:

  >>> import nltk
  >>> nltk.download('punkt')

  Searched in:
    - '/Users/nalinbhardwaj/nltk_data'
    - '/usr/share/nltk_data'
    - '/usr/local/share/nltk_data'
    - '/usr/lib/nltk_data'
    - '/usr/local/lib/nltk_data'
    - '/Library/Frameworks/Python.framework/Versions/3.6/nltk_data'
    - '/Library/Frameworks/Python.framework/Versions/3.6/lib/nltk_data'
    - ''
**********************************************************************