HTTP Error 503

[FelixChery]

youtube-dl -v --write-sub --write-auto-sub --output "%(upload_date)s-%(title)s.%(ext)s" --skip-downl
oad -i -c --dateafter 20080101 --datebefore 20091231 https://www.youtube.com/cha
nnel/UCKVsdeoHExltrWMuK0hOWmg
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--write-sub', '--write-auto-sub', '--output',
'%(upload_date)s-%(title)s.%(ext)s', '--skip-download', '-i', '-c', '--dateafte
r', '20080101', '--datebefore', '20091231', 'https://www.youtube.com/channel/UCK
VsdeoHExltrWMuK0hOWmg']
[debug] Encodings: locale cp1252, fs mbcs, out cp437, pref cp1252
[debug] youtube-dl version 2019.04.24
[debug] Python version 3.4.4 (CPython) - Windows-7-6.1.7601-SP1
[debug] exe versions: none
[debug] Proxy map: {}
[youtube:channel] UCKVsdeoHExltrWMuK0hOWmg: Downloading channel page
[youtube:playlist] UUKVsdeoHExltrWMuK0hOWmg: Downloading webpage
[download] Downloading playlist: Uploads from KTN News Kenya
[youtube:playlist] UUKVsdeoHExltrWMuK0hOWmg: Downloading page #1
[youtube:playlist] UUKVsdeoHExltrWMuK0hOWmg: Downloading page #2
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ERROR: Unable to download JSON metadata: HTTP Error 503: Service Unavailable (ca
used by HTTPError()); please report this issue on https://yt-dl.org/bug . Make s
ure 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.
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmp1l3rbf
78\build\youtube_dl\extractor\common.py", line 626, in _request_webpage
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmp1l3rbf
78\build\youtube_dl\YoutubeDL.py", line 2227, in urlopen
File "C:\Python\Python34\lib\urllib\request.py", line 470, in open
File "C:\Python\Python34\lib\urllib\request.py", line 580, in http_response
File "C:\Python\Python34\lib\urllib\request.py", line 502, in error
File "C:\Python\Python34\lib\urllib\request.py", line 442, in _call_chain
File "C:\Python\Python34\lib\urllib\request.py", line 685, in http_error_302
File "C:\Python\Python34\lib\urllib\request.py", line 470, in open
File "C:\Python\Python34\lib\urllib\request.py", line 580, in http_response
File "C:\Python\Python34\lib\urllib\request.py", line 508, in error
File "C:\Python\Python34\lib\urllib\request.py", line 442, in _call_chain
File "C:\Python\Python34\lib\urllib\request.py", line 588, in http_error_defau
lt

[FelixChery]

I was downloading subtitles for certain videos on a youtube channel based on upload date. What could be the cause of this or the alternative way to do so?

[dstftw]

Most likely temporary youtube side issue.