Traceback (most recent call last):

 "/usr/local/lib/python2.7/dist-packages/OctoPrint-1.3.0.dev125_g4f5dc70-py2.7.egg/octoprint/plugins/pluginmanager/**init**.py", line 221, in command_install
returncode, stdout, stderr = self._call_pip(pip_args)

 "/usr/local/lib/python2.7/dist-packages/OctoPrint-1.3.0.dev125_g4f5dc70-py2.7.egg/octoprint/plugins/pluginmanager/__init__.py", line 423, in _call_pip
raise RuntimeError(u"No pip available, can't operate".format(**locals()))RuntimeError: No pip available, can't operate
Traceback (most recent call last):


 "C:\Users\hoang\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\font_manager.py", line 1459, in <module>

fontManager = json_load(_fmcache)


 "C:\Users\hoang\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\font_manager.py", line 986, in json_load

return json.load(fh, object_hook=_json_decode)


 "C:\Users\hoang\AppData\Local\Programs\Python\Python36\lib\json\__init__.py", line 299, in load

parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)


 "C:\Users\hoang\AppData\Local\Programs\Python\Python36\lib\json\__init__.py", line 367, in loads

return cls(**kw).decode(s)


 "C:\Users\hoang\AppData\Local\Programs\Python\Python36\lib\json\decoder.py", line 339, in decode

obj, end = self.raw_decode(s, idx=_w(s, 0).end())


 "C:\Users\hoang\AppData\Local\Programs\Python\Python36\lib\json\decoder.py", line 355, in raw_decode

obj, end = self.scan_once(s, idx)
json.decoder.JSONDecodeError: Expecting ',' delimiter: line 3961 column 28 (char 119107)
