Traceback (most recent call last):


 "/usr/local/lib/python3.5/site-packages/pafy/backend_youtube_dl.py", line 38, in _fetch_basic

self._ydl_info = ydl.extract_info(self.videoid, download=False)


 "/usr/local/lib/python3.5/site-packages/youtube_dl/YoutubeDL.py", line 688, in extract_info

self.report_error(compat_str(e), e.format_traceback())


 "/usr/local/lib/python3.5/site-packages/youtube_dl/YoutubeDL.py", line 547, in report_error

self.trouble(error_message, tb)


 "/usr/local/lib/python3.5/site-packages/youtube_dl/YoutubeDL.py", line 517, in trouble

raise DownloadError(message, exc_info)
youtube_dl.utils.DownloadError: ERROR: Signature extraction failed: Traceback (most recent call last):

Traceback (most recent call last):


 "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 530, in extract

ie_result = self._real_extract(url)


 "/usr/local/bin/youtube-dl/youtube_dl/extractor/egghead.py", line 98, in _real_extract

for _, format_url in lesson['media_urls'].items():
KeyError: u'media_urls'
