[youtube] TypeError: sequence item 0: expected str instance, NoneType found

[remitamine]

youtube-dl -v http://www.youtube.com/watch?v=jyOgZ8tXZV4
[debug] System config: []
[debug] User config: ['--external-downloader', 'aria2c', '--external-downloader-args', '-x 16 --check-certificate=false', '-f', 'best[height<=?720]', '--sub-lang', 'ar,en', '--write-sub']
[debug] Command-line args: ['-v', 'http://www.youtube.com/watch?v=jyOgZ8tXZV4']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.07.21
[debug] Python version 3.4.3 - Linux-4.1.2-2-ARCH-x86_64-with-arch-Arch-Linux
[debug] exe versions: ffmpeg 2.7.2, ffprobe 2.7.2, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] jyOgZ8tXZV4: Downloading webpage
[youtube] jyOgZ8tXZV4: Downloading video info webpage
Traceback (most recent call last):
  File "/usr/bin/youtube-dl", line 9, in <module>
    load_entry_point('youtube-dl==2015.7.21', 'console_scripts', 'youtube-dl')()
  File "/usr/lib/python3.4/site-packages/youtube_dl/__init__.py", line 410, in main
    _real_main(argv)
  File "/usr/lib/python3.4/site-packages/youtube_dl/__init__.py", line 400, in _real_main
    retcode = ydl.download(all_urls)
  File "/usr/lib/python3.4/site-packages/youtube_dl/YoutubeDL.py", line 1503, in download
    url, force_generic_extractor=self.params.get('force_generic_extractor', False))
  File "/usr/lib/python3.4/site-packages/youtube_dl/YoutubeDL.py", line 656, in extract_info
    ie_result = ie.extract(url)
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/common.py", line 275, in extract
    return self._real_extract(url)
  File "/usr/lib/python3.4/site-packages/youtube_dl/extractor/youtube.py", line 981, in _real_extract
    ', '.join(map(ISO3166Utils.short2full, regions_allowed.split(',')))),
TypeError: sequence item 0: expected str instance, NoneType found