Traceback (most recent call last):


 "C:\Users\S10500\AppData\Local\Continuum\anaconda3\lib\site-packages\spyder\widgets\ipythonconsole\client.py", line 575, in show_time

elapsed_time = time.monotonic() - self.t0
TypeError: unsupported operand type(s) for -: 'float' and 'NoneType'

Traceback (most recent call last):


 "/home/jupyterhub/0.7.2/lib/python3.5/site-packages/tornado/web.py", line 1511, in _execute

result = yield result


 "/home/jupyterhub/0.7.2/lib/python3.5/site-packages/csauth/login.py", line 61, in post

identity = json.loads(self.request.headers.get(self.authenticator.header_identity))


 "/home/opt/python3/lib/python3.5/json/__init__.py", line 312, in loads

s.__class__.__name__))
TypeError: the JSON object must be str, not 'NoneType'
