Traceback (most recent call last):

 "/usr/lib/python3.4/site-packages/youtube_dl/YoutubeDL.py", line 524, in extract_info
ie_result = ie.extract(url)

 "/usr/lib/python3.4/site-packages/youtube_dl/extractor/common.py", line 193, in extract
return self._real_extract(url)

 "/usr/lib/python3.4/site-packages/youtube_dl/extractor/generic.py", line 907, in _real_extract
raise ExtractorError('Unsupported URL: %s' % url)youtube_dl.utils.ExtractorError: Unsupported URL: http://techchannel.att.com/play-video.cfm/2014/1/27/ATT-Archives-The-UNIX-System-Making-Computers-Easier-to-Use; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type
youtube-dl -U
to update.
Traceback (most recent call last):


 "C:\Users\Administrator\AppData\Local\Programs\Python\Python38\Scripts\ykdl-script.py", line 11, in <module>

load_entry_point('ykdl==1.6.2', 'console_scripts', 'ykdl')()


 "c:\users\administrator\appdata\local\programs\python\python38\lib\site-packages\cykdl\__main__.py", line 173, in main

info = parser(u)


 "c:\users\administrator\appdata\local\programs\python\python38\lib\site-packages\ykdl\extractor.py", line 24, in parser

info = self.prepare()


 "c:\users\administrator\appdata\local\programs\python\python38\lib\site-packages\ykdl\extractors\douyu\live.py", line 39, in prepare

html_content = get_content(api_url)


 "c:\users\administrator\appdata\local\programs\python\python38\lib\site-packages\ykdl\util\html.py", line 67, in get_content

response = urlopen(req)


 "c:\users\administrator\appdata\local\programs\python\python38\lib\urllib\request.py", line 222, in urlopen

return opener.open(url, data, timeout)


 "c:\users\administrator\appdata\local\programs\python\python38\lib\urllib\request.py", line 531, in open

response = meth(req, response)


 "c:\users\administrator\appdata\local\programs\python\python38\lib\urllib\request.py", line 640, in http_response

response = self.parent.error(


 "c:\users\administrator\appdata\local\programs\python\python38\lib\urllib\request.py", line 569, in error

return self._call_chain(*args)


 "c:\users\administrator\appdata\local\programs\python\python38\lib\urllib\request.py", line 502, in _call_chain

result = func(*args)


 "c:\users\administrator\appdata\local\programs\python\python38\lib\urllib\request.py", line 649, in http_error_default

raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: Not Found
