Can you add the full error traceback? Also mention your python version, Chrome, and windows version.

The issue is Chrome locks the cookies file while running. One workaround is copy the Cookies file to a temp location first, then read from the copy. Chrome on Windows keeps the file locked so direct access won't work.

import shutil
import tempfile
import browser_cookie3

cookies_path = "path/to/Chrome/Cookies"
temp_cookies = tempfile.mktemp()
shutil.copy2(cookies_path, temp_cookies)

But this won't get live session cookies this show only what was saved to disk.