Basic YouTube download throwing errors

[mohsen1]

$ youtube-dl -v XI2dVIB8_tU
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'XI2dVIB8_tU']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2016.03.06
[debug] Python version 2.7.11 - Darwin-15.3.0-x86_64-i386-64bit
Traceback (most recent call last):
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 162, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/usr/local/bin/youtube-dl/__main__.py", line 19, in <module>
  File "/usr/local/bin/youtube-dl/youtube_dl/__init__.py", line 412, in main
  File "/usr/local/bin/youtube-dl/youtube_dl/__init__.py", line 379, in _real_main
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 348, in __init__
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 1970, in print_debug_header
  File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 51, in get_versions
  File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 35, in __init__
  File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 92, in _determine_executables
  File "/usr/local/bin/youtube-dl/youtube_dl/postprocessor/ffmpeg.py", line 92, in <genexpr>
  File "/usr/local/bin/youtube-dl/youtube_dl/utils.py", line 1565, in get_exe_version
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 710, in __init__
    errread, errwrite)
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1334, in _execute_child
    child_exception = pickle.loads(data)
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 1388, in loads
    return Unpickler(file).load()
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 864, in load
    dispatch[key](self)
  File "/usr/local/Cellar/python/2.7.11/Frameworks/Python.framework/Versions/2.7/lib/python2.7/pickle.py", line 972, in load_string
    raise ValueError, "insecure string pickle"
ValueError: insecure string pickle

  youtube-dl --update
youtube-dl is up-to-date (2016.03.06)

[dstftw]

Duplicate of #6840.