youtube-dl issues warning "unable to extract uploader; please report this issue on https://yt-dl.org/bug" but otherwise works fine

[9991212]

• I've verified and I assure that I'm running youtube-dl 2019.03.01

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)

---

If the purpose of this issue is a bug report

Add the -v flag to your command line you run youtube-dl with (youtube-dl -v <your command line>), copy the whole output and insert it here.

---

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--simulate', u'--verbose', u'--restrict-filenames', u'--format', u'318319398883646v+279049066122165ad', u'--keep-video', u'https://www.facebook.com/blacksabbathgirls/videos/2432216853472642/']
[debug] Encodings: locale cp1250, fs mbcs, out None, pref cp1250
[debug] youtube-dl version 2019.03.01
[debug] Python version 2.7.14 (CPython) - Windows-XP-5.1.2600-SP3
[debug] exe versions: ffmpeg N-76860-g72eaf72, ffprobe N-92405-ge24a754916
[debug] Proxy map: {}
WARNING: unable to extract uploader; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see https://yt-dl.org/update on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.

Description of your issue, suggested solution and other information

Honestly, I am posting this mainly because I was asked to do this (“WARNING: unable to extract uploader; please report this issue on https://yt-dl.org/bug” – see log from stderr above).
In spite of the warning, all the downloading and merging went flawlessly; I did not encounter any problems, finally.

[9991212]

Sorry, I forgot to add a log from stdout:

[facebook] 2432216853472642: Downloading webpage