IndexError: pop from empty list

[slotbite]

<Element html at 0x147f197a728>
Traceback (most recent call last):
  File "c:/Users/cvargasa/Documents/IMG/Scrapy/linkedin-learning-downloader/linkedin_learning.py", line 227, in <module>
    loop.run_until_complete(process())
  File "C:\Users\cvargasa\AppData\Local\conda\conda\envs\cnn - copia\lib\asyncio\base_events.py", line 468, in run_until_complete
    return future.result()
  File "c:/Users/cvargasa/Documents/IMG/Scrapy/linkedin-learning-downloader/linkedin_learning.py", line 211, in process
    await login(USERNAME, PASSWORD)
  File "c:/Users/cvargasa/Documents/IMG/Scrapy/linkedin-learning-downloader/linkedin_learning.py", line 83, in login
    csrf = html.xpath("//input[@id='loginCsrfParam-login']/@value").pop()
IndexError: pop from empty list

[liepaja]

Replace linkedin url with a sign up form url like "https://www.linkedin.com/login?fromSignIn=true&trk=guest_homepage-basic_nav-header-signin"

[MustafaUzun447]

How we replace? can you explain more?