Subtitle downloading sporadically fails

[arghc]

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Subtitles sporadically do not download. After adding the "-v" to a command in order to report the error, a subtitle that previously did not download did. Others continue not to download but as I rerun the list from time to time one will download.

This is one that worked after not working for a few runs:

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-o', u'Charmed.2018.S01E01.Pilot.mp4', u'-v', u'--skip-download', u'--all-subs', u'http://www.cwtv.com/shows/charmed/pilot/?play=b42cf727-384f-453e-9013-572e0ae243e4']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.10.05
[debug] Python version 2.7.14 (CPython) - Darwin-17.7.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg N-91200-g1616b1be5a-tessus
[debug] Proxy map: {}
[CWTV] b42cf727-384f-453e-9013-572e0ae243e4: Downloading JSON metadata
[ThePlatform] b42cf727-384f-453e-9013-572e0ae243e4: Downloading SMIL data
[ThePlatform] b42cf727-384f-453e-9013-572e0ae243e4: Downloading m3u8 information
[ThePlatform] b42cf727-384f-453e-9013-572e0ae243e4: Downloading m3u8 information
[ThePlatform] b42cf727-384f-453e-9013-572e0ae243e4: Downloading JSON metadata
[debug] Default format spec: bestvideo+bestaudio/best
[info] Writing video subtitles to: Charmed.2018.S01E01.Pilot.en.vtt
<end of log>

Here's one that continues not to work, for now:

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'-o', u'Black.Lightning.S01E09.The.Book.of.Little.Black.Lies.mp4', u'--skip-download', u'--all-subs', u'http://www.cwtv.com/shows/black-lightning/the-book-of-little-black-lies/?play=623c25f4-387b-4b3c-aae3-f6ec9b9b8816']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.10.05
[debug] Python version 2.7.14 (CPython) - Darwin-17.7.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg N-91200-g1616b1be5a-tessus
[debug] Proxy map: {}
[CWTV] 623c25f4-387b-4b3c-aae3-f6ec9b9b8816: Downloading JSON metadata
ERROR: An extractor error has occurred. (caused by KeyError(u'video',)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 507, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/cwtv.py", line 71, in _real_extract
    video_id)['video']
KeyError: u'video'
Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 792, in extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 520, in extract
    raise ExtractorError('An extractor error has occurred.', cause=e)
ExtractorError: An extractor error has occurred. (caused by KeyError(u'video',)); please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
<end of log>