Traceback (most recent call last):


 "pymc3-try.py", line 43, in <module>

main(model)


 "pymc3-try.py", line 13, in main

trace = pm.sample(20000, step=step, model=model, njobs=1)


 "C:\Miniconda2\envs\mcmc\lib\site-packages\pymc3\sampling.py", line 252, in sample

progressbar=progressbar, **args)


 "C:\Miniconda2\envs\mcmc\lib\site-packages\pymc3\sampling.py", line 879, in init_nuts

step = pm.NUTS(potential=potential, **kwargs)


 "C:\Miniconda2\envs\mcmc\lib\site-packages\pymc3\step_methods\arraystep.py", line 39, in __new__

model = modelcontext(kwargs.get('model'))


 "C:\Miniconda2\envs\mcmc\lib\site-packages\pymc3\model.py", line 147, in modelcontext

return Model.get_context()


 "C:\Miniconda2\envs\mcmc\lib\site-packages\pymc3\model.py", line 139, in get_context

raise TypeError("No context on context stack")
TypeError: No context on context stack

Traceback (most recent call last):

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/youtube.py", line 1511, in _real_extract
playlist_title = self._og_search_title(page)

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 428, in _og_search_title
return self._og_search_property('title', html, *_kargs)

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 416, in _og_search_property
escaped = self._search_regex(self._og_regexes(prop), html, name, flags=re.DOTALL, *_kargs)

 "/usr/lib/python2.7/dist-packages/youtube_dl/extractor/common.py", line 356, in _search_regex
raise RegexNotFoundError(u'Unable to extract %s' % _name)RegexNotFoundError: Unable to extract OpenGraph title; please report this issue on https://yt-dl.org/bug . Be sure to call youtube-dl with the --verbose flag and include its complete output. Make sure you are using the latest version; type
youtube-dl -U
to update.