Werkzeug Internal Server Error

traceback.txt

Traceback (most recent call last):
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/flask_appbuilder/security/decorators.py", line 26, in wraps
    return f(self, *args, **kwargs)
  File "/home/michael/panoramix/panoramix/utils.py", line 205, in wrapper
    return f(*args, **kwargs)
  File "/home/michael/panoramix/panoramix/views.py", line 414, in explore
    payload = obj.get_json()
  File "/home/michael/panoramix/panoramix/viz.py", line 216, in get_json
    'data': json.loads(self.get_json_data()),
  File "/home/michael/panoramix/panoramix/viz.py", line 730, in get_json_data
    df = self.get_df()
  File "/home/michael/panoramix/panoramix/viz.py", line 646, in get_df
    df = super(NVD3TimeSeriesViz, self).get_df(query_obj)
  File "/home/michael/panoramix/panoramix/viz.py", line 136, in get_df
    df.timestamp = pd.to_datetime(df.timestamp, utc=False)
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/pandas/tseries/tools.py", line 343, in to_datetime
    return _convert_listlike(arg, box, format)
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/pandas/tseries/tools.py", line 266, in _convert_listlike
    if com.is_datetime64_ns_dtype(arg):
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/pandas/core/common.py", line 2513, in is_datetime64_ns_dtype
    tipo = _get_dtype(arr_or_dtype)
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/pandas/core/common.py", line 2458, in _get_dtype
    return arr_or_dtype.dtype
  File "/home/michael/.virtualenvs/panoramix/lib/python2.7/site-packages/pandas/core/generic.py", line 2150, in __getattr__
    (type(self).__name__, name))
AttributeError: 'DataFrame' object has no attribute 'dtype'