Traceback (most recent call last):
  File "summerisers.py", line 39, in <module>
    summary = " ".join([obj._text for obj in s(parser.document, sentenceCntOut)])
  File "C:\py38_64\lib\site-packages\sumy\summarizers\sum_basic.py", line 27, in __call__
    ratings = self._compute_ratings(sentences)
  File "C:\py38_64\lib\site-packages\sumy\summarizers\sum_basic.py", line 110, in _compute_ratings
    best_sentence_index = self._find_index_of_best_sentence(word_freq, sentences_as_words)
  File "C:\py38_64\lib\site-packages\sumy\summarizers\sum_basic.py", line 92, in _find_index_of_best_sentence
    word_freq_avg = self._compute_average_probability_of_words(word_freq, words)
  File "C:\py38_64\lib\site-packages\sumy\summarizers\sum_basic.py", line 75, in _compute_average_probability_of_words
    word_freq_sum = sum([word_freq_in_doc[w] for w in content_words_in_sentence])
  File "C:\py38_64\lib\site-packages\sumy\summarizers\sum_basic.py", line 75, in <listcomp>
    word_freq_sum = sum([word_freq_in_doc[w] for w in content_words_in_sentence])
KeyError: 'look'