WARNING: Writing cache to u'/root/.cache/youtube-dl/youtube-sigfuncs/js_vfl9FYC6l_83.json' failed: Traceback (most recent call last):

 "/usr/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 392, in _extract_signature_function
cache_res = res(test_string)

 "/usr/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 450, in <lambda>
return lambda s: initial_function([s])

 "/usr/bin/youtube-dl/youtube_dl/jsinterp.py", line 148, in resf
res = self.interpret_statement(stmt, local_vars)

 "/usr/bin/youtube-dl/youtube_dl/jsinterp.py", line 44, in interpret_statement
'Cannot determine left side of statement in %r' % stmt)ExtractorError: Cannot determine left side of statement in u'jo.Dv(a,28)'; 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.
Traceback (most recent call last):


 "eventHandler.pyc", line 150, in executeEvent


 "eventHandler.pyc", line 163, in doPreGainFocus


 "api.pyc", line 106, in setFocusObject


 "baseObject.pyc", line 46, in __get__


 "baseObject.pyc", line 149, in _getPropertyViaCache


 "NVDAObjects\__init__.pyc", line 504, in _get_container


 "baseObject.pyc", line 46, in __get__


 "baseObject.pyc", line 149, in _getPropertyViaCache


 "NVDAObjects\IAccessible\__init__.pyc", line 968, in _get_parent


 "NVDAObjects\__init__.pyc", line 127, in __call__


 "NVDAObjects\IAccessible\adobeAcrobat.pyc", line 61, in initOverlayClass
TypeError: '>' not supported between instances of 'NoneType' and 'int'
