selenium error

[Abubakr95]

File "cheggDL.py", line 65, in download_textbook
expand = driver.find_element_by_id('fullscreen')
File "C:\Python34\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 360, in find_element_by_id
return self.find_element(by=By.ID, value=id_)
File "C:\Python34\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 978, in find_element
'value': value})['value']

File "C:\Python34\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line 242, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.NoSuchElementException: Message: no such element: Unable to locate element: {"method":"css selector","selector":"[id="fullscreen"]"}
(Session info: chrome=91.0.4472.77)