Traceback (most recent call last):

 "/usr/lib/python2.7/site-packages/khal/khalendar/khalendar.py", line 175, in _update_vevent
self._dbtool.update(event.raw, href=href, etag=etag)

 "/usr/lib/python2.7/site-packages/khal/khalendar/backend.py", line 253, in update
self._update_impl(vevent, href, etag)

 "/usr/lib/python2.7/site-packages/khal/khalendar/backend.py", line 280, in _update_impl
dtstartend = aux.expand(vevent, self.locale['default_timezone'], href)

 "/usr/lib/python2.7/site-packages/khal/khalendar/aux.py", line 72, in expand
rrule._until = rrule._until.astimezone(events_tz)TypeError: astimezone() argument 1 must be datetime.tzinfo, not None
ERROR: Signature extraction failed: Traceback (most recent call last):

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 658, in _decrypt_signature
video_id, player_url, s

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 550, in _extract_signature_function
raise ExtractorError('Cannot identify player %r' % player_url)ExtractorError: Cannot identify player u'https://s.ytimg.com/yts/jsbin/player-en_US-vflpmpoFG/base.js'; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; see
https://yt-dl.org/update
on how to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.