Swimbot Error

Traceback (most recent call last):
  File "/home/pi/.local/lib/python3.7/site-packages/discord/ext/commands/core.py", line 85, in wrapped
    ret = await coro(*args, **kwargs)
  File "/home/pi/Swimbot/cc.py", line 216, in k
    notes_index = pruned_full_website.index("DateNoteAuthor")
ValueError: 'DateNoteAuthor' is not in list