'NoneType' object has no attribute 'send_keys'

This error message is commonly seen when using the `send_keys()` method in Python on a variable that is `None`.

For example, let's say you have the following code:

from selenium import webdriver

driver = webdriver.Chrome()
search_box = driver.find_element_by_name('q')
search_box.send_keys('Python')

If the `find_element_by_name()` method does not find an element with the name 'q', it will return `None`. In this case, if `search_box` is `None`, then calling `send_keys()` on it will raise the `'NoneType' object has no attribute 'send_keys'` error.

To avoid this error, you can add a check to make sure that `search_box` is not `None` before calling `send_keys()`:

from selenium import webdriver

driver = webdriver.Chrome()
search_box = driver.find_element_by_name('q')
if search_box is not None:
    search_box.send_keys('Python')
else:
    print('Element not found')