ERROR_This video is unavailable_There is a problem with youtube.com download.

[LIERTTTTTT]

Here is the code:

youtube-dl https://www.youtube.com/watch?v=nZ6xdX5-5Pc --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'https://www.youtube.com/watch?v=nZ6xdX5-5Pc', u'--verbose']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.07.14
[debug] Python version 2.7.5 (CPython) - Linux-3.10.0-957.1.3.el7.x86_64-x86_64-with-centos-7.6.1810-Core
[debug] exe versions: ffmpeg 4.1-static, ffprobe 4.1-static
[debug] Proxy map: {}
[youtube] nZ6xdX5-5Pc: Downloading webpage
[youtube] nZ6xdX5-5Pc: Downloading video info webpage
ERROR: This video is unavailable.
Traceback (most recent call last):
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 796, in extract_info
ie_result = ie.extract(url)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 530, in extract
ie_result = self._real_extract(url)
File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 2109, in _real_extract
raise ExtractorError(error_message, expected=True)
ExtractorError: This video is unavailable.

There is no problem in the version 2019.07.12,but in 2019.07.14 ,it's happened.
Please fix it .Thank you^_^