can't down pronhub playlist

[lihuacai168]

root@vultr:~# youtube-dl -v --playlist-end 2 -f best https://www.pornhub.com/playlist/38516402
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', '--playlist-end', '2', '-f', 'best', 'https://www.pornhub.com/playlist/38516402']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.03.14
[debug] Python version 3.6.5 (CPython) - Linux-4.15.0-23-generic-x86_64-with-Ubuntu-18.04-bionic
[debug] exe versions: none
[debug] Proxy map: {}
[PornHubPlaylist] 38516402: Downloading webpage
[download] Downloading playlist: Squirt like a fountain!!
[PornHubPlaylist] playlist Squirt like a fountain!!: Collected 33 video ids (downloading 2 of them)
[download] Downloading video 1 of 2
[PornHub] ph58e99fa2c6c71: Downloading webpage
[PornHub] ph58e99fa2c6c71: Downloading webpage
ERROR: Unable to extract encoded url; 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.
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/youtube_dl/YoutubeDL.py", line 785, in extract_info
ie_result = ie.extract(url)
File "/usr/lib/python3/dist-packages/youtube_dl/extractor/common.py", line 440, in extract
ie_result = self._real_extract(url)
File "/usr/lib/python3/dist-packages/youtube_dl/extractor/pornhub.py", line 141, in _real_extract
'encoded url').split(';')
File "/usr/lib/python3/dist-packages/youtube_dl/extractor/common.py", line 796, in _search_regex
raise RegexNotFoundError('Unable to extract %s' % _name)
youtube_dl.utils.RegexNotFoundError: Unable to extract encoded url; 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.