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This error can be resolved by ensuring that the CountVectorizer object has been fit with the data before calling the getfeaturenames() attribute.

For example, after creating a CountVectorizer object, the next step would typically be to fit it to the data using the fit_transform() method, like this:

cv = CountVectorizer()
doc_word_matrix = cv.fit_transform(documents)

Once the CountVectorizer has been fit to the data in this way, the getfeaturenames() attribute can then be called without issue:

feature_names = cv.get_feature_names()

If you try to call getfeaturenames() before fitting the CountVectorizer to the data, you will receive the "AttributeError: 'CountVectorizer' object lacks 'getfeaturenames' attribute" error.