humanize

Install the package using pip: `pip install humanize`

Ensure both datetime objects are either consistently timezone-naive or timezone-aware and in the same timezone. You can explicitly provide a timezone-aware reference point using the `when` parameter in `naturaltime`. 
```python
import datetime
import humanize

# Example: Convert to UTC if the original datetime is timezone-aware
aware_dt = datetime.datetime.now(datetime.timezone.utc)
print(humanize.naturaltime(aware_dt, when=datetime.datetime.now(datetime.timezone.utc)))

# Example: Make the input datetime naive if local time comparison is intended
naive_dt = datetime.datetime.now().replace(tzinfo=None)
print(humanize.naturaltime(naive_dt))
```

First, ensure the function name is spelled correctly. If it is, upgrade the `humanize` library to its latest version: `pip install --upgrade humanize`. Then consult the official documentation for the correct usage.

Ensure the locale string is correct (e.g., 'es_ES', 'fr_FR') and that the necessary translation files for `humanize` exist and are accessible at the specified path (if provided). If using a standard locale, ensure `humanize` is correctly installed, as it ships with its own translations. 
```python
import humanize

# Example with a supported locale
try:
    humanize.i18n.activate('es_ES')
    print(humanize.naturalday(datetime.date.today()))
except FileNotFoundError as e:
    print(f"Translation error: {e}. Check if 'es_ES' translations are available or path is correct.")
```