Unable to download Video from youtube!

[collegeimprovements]

Hi,
I'm not able to download video from the below mentioned url:

https://www.youtube.com/watch?v=1wiU18m7mAE&list=PLEry65uVHEikLzKkQgDymyQmd5YMzZ664&index=2

[collegeimprovements]

Error Message :
ydl https://www.youtube.com/watch\?v\=1wiU18m7mAE\&list\=PLEry65uVHEikLzKkQgDymyQmd5YMzZ664\&index\=2
[youtube:playlist] PLEry65uVHEikLzKkQgDymyQmd5YMzZ664: Downloading page #1
[download] Downloading playlist: Geometry
[youtube:playlist] playlist 'Geometry': Collected 2 video ids (downloading 2 of them)
[download] Downloading video #1 of 2
[youtube] Setting language
[youtube] 1wiU18m7mAE: Downloading video webpage
[youtube] 1wiU18m7mAE: Downloading video info webpage
[youtube] 1wiU18m7mAE: Extracting video information
[youtube] 1wiU18m7mAE: Encrypted signatures detected.
ERROR: unable to download video

[dstftw]

Post the full output you get when running with --verbose option

[collegeimprovements]

ydl --verbose https://www.youtube.com/watch\?v\=1wiU18m7mAE\&list\=PLEry65uVHEikLzKkQgDymyQmd5YMzZ664\&index\=2
[debug] System config: []
[debug] User config: []
[debug] Command-line args: ['-f', '18', '--verbose', 'https://www.youtube.com/watch?v=1wiU18m7mAE&list=PLEry65uVHEikLzKkQgDymyQmd5YMzZ664&index=2']
[debug] youtube-dl version 2013.06.34.2
[debug] Python version 2.7.2 - Darwin-12.3.0-x86_64-i386-64bit
[debug] Proxy map: {}
[youtube:playlist] PLEry65uVHEikLzKkQgDymyQmd5YMzZ664: Downloading page #1
[download] Downloading playlist: Geometry
[youtube:playlist] playlist 'Geometry': Collected 2 video ids (downloading 2 of them)
[download] Downloading video #1 of 2
[youtube] Setting language
[youtube] 1wiU18m7mAE: Downloading video webpage
[youtube] 1wiU18m7mAE: Downloading video info webpage
[youtube] 1wiU18m7mAE: Extracting video information
[youtube] 1wiU18m7mAE: Encrypted signatures detected.
[youtube] encrypted signature length 88 (44.43), itag 22, html5 player en_US-vflqZIm5b
[youtube] encrypted signature length 88 (44.43), itag 43, html5 player en_US-vflqZIm5b
[youtube] encrypted signature length 88 (44.43), itag 18, html5 player en_US-vflqZIm5b
[youtube] encrypted signature length 88 (44.43), itag 5, html5 player en_US-vflqZIm5b
[youtube] encrypted signature length 88 (44.43), itag 36, html5 player en_US-vflqZIm5b
[youtube] encrypted signature length 88 (44.43), itag 17, html5 player en_US-vflqZIm5b
ERROR: unable to download video
Traceback (most recent call last):
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 567, in download
videos = self.extract_info(url)
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 320, in extract_info
return self.process_ie_result(ie_result, download=download)
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 402, in process_ie_result
for r in ie_result['entries']
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 392, in process_ie_result
extra_info=extra)
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 357, in process_ie_result
extra_info=extra_info)
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 320, in extract_info
return self.process_ie_result(ie_result, download=download)
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 402, in process_ie_result
for r in ie_result['entries']
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 349, in process_ie_result
self.process_info(ie_result)
File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 544, in process_info
raise UnavailableVideoError()
UnavailableVideoError

[phihag]

Your version of youtube-dl is hopelessly outdated (YouTube changes its interface about once every couple of months). Type sudo youtube-dl -U to update.