AttributeError: 'CountVectorizer' object has no attribute 'get_feature_names'

This error occurs when you try to call the `get_feature_names()` method on a `CountVectorizer` object, but the object does not have this attribute.

Possible reasons for this error include:

- You misspelled the method name (`get_feature_names()`).
- You are using an outdated version of the `CountVectorizer` class that does not have this attribute.
- You have not fit the `CountVectorizer` object to any data yet, so it does not have any feature names to return.

To resolve this error, you can try the following:

- Double-check that you are spelling the method name correctly.
- Upgrade to a newer version of the `CountVectorizer` class that includes the `get_feature_names()` method.
- Ensure that you have fit the `CountVectorizer` object to some data before calling `get_feature_names()`, so that it has feature names to return.