Invalid Api Credentials

Hello Sujiit,
I have Kite Connect app and also subscribed for historical data to access this API. But still I am getting an error as " TokenException: Invalid API credentials". and also the following are shown as errors.

TokenException Traceback (most recent call last)
in ()
92 strategy(records)
93
---> 94 start()

in start()
89
90 def start():
---> 91 records = get_historical_data()
92 strategy(records)
93

in get_historical_data()
21 # Gets historical data from Kite Connect
22 def get_historical_data():
---> 23 return kite.historical(instrument_token, from_date, to_date, interval)
24
25 """

~\Anaconda3\lib\site-packages\kiteconnect\__init__.py in historical(self, instrument_token, from_date, to_date, interval, continuous)
536 "to": to_date,
537 "interval": interval,
--> 538 "continuous": 1 if continuous else 0})
539
540 records = []

~\Anaconda3\lib\site-packages\kiteconnect\__init__.py in _get(self, route, params)
591 def _get(self, route, params=None):
592 """Alias for sending a GET request."""
--> 593 return self._request(route, "GET", params)
594
595 def _post(self, route, params=None):

~\Anaconda3\lib\site-packages\kiteconnect\__init__.py in _request(self, route, method, parameters)
682 code=r.status_code))
683 elif exp:
--> 684 raise(exp(data["message"], code=r.status_code))
685 else:
686 raise(ex.GeneralException(data["message"], code=r.status_code))

TokenException: Invalid API credentials