Access token issue

The code was working till yesterday.
@sujith kindly advise

@rakeshr , The code was working for the last 2 weeks.
I went through the communication thread and verified that the api_key and api_secret file does not have any carriage return.

Below is the login code which I am using for the last few weeks.

from kiteconnect import KiteConnect
# api_key is in my_api_key.txt file
my_api_key = open('/Users/macdev1/PycharmProjects/SMLogin2/input_data/my_api_key.txt', 'r').read()
# api_secret is in my_api_secret.txt file
my_api_secret = open('/Users/macdev1/PycharmProjects/SMLogin2/input_data/my_api_secret.txt', 'r').read()

kite = KiteConnect(api_key=my_api_key)

# Note - section 1 and 2 and 3 are disjoint and should not be executed simultaneously
# 1-start till request token generation, comment out the entire section after access token has been generated
login_url = kite.login_url() #1.1
print(login_url) #1.2
# 1-end

# Login into the URL and PIN and get request token
# Paste the request token in my_request_token.txt
# Use this to delete your access token
#my_access_token = open('/Users/macdev1/PycharmProjects/SMLogin2/input_data/my_access_token.txt', 'r').read()
# kite.invalidate_access_token(my_access_token)

# 2-start Use this
my_request_token = open('input_data/my_request_token.txt','r').read() #2.1
input_data = kite.generate_session(my_request_token, my_api_secret) #2.2
kite.set_access_token(input_data["access_token"]) #2.3
print(input_data["access_token"]) #2.4
my_access_token_file = open("input_data/my_access_token.txt","w") #2.5
my_access_token_file.write(input_data["access_token"]) #2.6
my_access_token_file.close() #2.7
#2-end

# 3-start - use access token that was saved earlier and comment section 1
my_access_token = open('/Users/macdev1/PycharmProjects/SMLogin2/input_data/my_access_token.txt', 'r').read() #3.1
kite.set_access_token(my_access_token) #3.2
# 3-end

Please advise. I have tried invalidating the access token and tried all over again but that too did not work.

my_api_key = open('/Users/macdev1/PycharmProjects/SMLogin2/input_data/my_api_key.txt', 'r').read()
my_api_secret = open('/Users/macdev1/PycharmProjects/SMLogin2/input_data/my_api_secret.txt', 'r').read()

Can you re-check on api_key and api_secret file read part, that it's sent as string?

Can you run in debug mode and check what is the status code and exact error message?

Hi @sujith , I am a novice programmer but my code was running ok for more than last few weeks. Please advise how I can run in debug mode. A short one on one session might close this issue faster.

Please advise how I can run in debug mode.

You can enable debug logging in your code by adding below code:

import logging
logging.basicConfig(level=logging.DEBUG)

@rakeshr I enabled the debug as you advised. Below are the results -
/Users/macdev1/PycharmProjects/SMLogin2/venv/bin/python /Users/macdev1/PycharmProjects/SMLogin2/py1.py
DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): api.kite.trade:443
DEBUG:urllib3.connectionpool:https://api.kite.trade:443 "POST /session/token HTTP/1.1" 200 None

I am getting the below error
Start Time: Thu Apr 8 13:15:28 2021
DEBUG:urllib3.connectionpool:Starting new HTTPS connection (1): api.kite.trade:443
DEBUG:urllib3.connectionpool:https://api.kite.trade:443 "GET /instruments/historical/1793/5minute?from=2021-01-27+09%3A15%3A00&to=2021-01-27+15%3A29%3A59&interval=5minute&continuous=0&oi=0 HTTP/1.1" 400 109
Traceback (most recent call last):
File "/Users/macdev1/PycharmProjects/SMLogin2/py2.py", line 70, in
m1_records = kite.historical_data(token, from_date=from_date, to_date=to_date, interval=m5_interval)
File "/Users/macdev1/PycharmProjects/SMLogin2/venv/lib/python3.6/site-packages/kiteconnect/connect.py", line 627, in historical_data
"oi": 1 if oi else 0
File "/Users/macdev1/PycharmProjects/SMLogin2/venv/lib/python3.6/site-packages/kiteconnect/connect.py", line 822, in _get
return self._request(route, "GET", url_args=url_args, params=params, is_json=is_json)
File "/Users/macdev1/PycharmProjects/SMLogin2/venv/lib/python3.6/site-packages/kiteconnect/connect.py", line 894, in _request
raise exp(data["message"], code=r.status_code)
kiteconnect.exceptions.InputException: Invalid `api_key` or `access_token`.

Thanks @rakeshr for your response.
As of now I am only fetching historical data and am not using any other API.
I am using the app created in Kite.Trade and using local web server to get the request token and then generate the access token. I am able to generate the access token but when I try to fetch the data, as that point I am getting the api key error.
Yes I was using the same code earlier and was able to fetch historical data as well.

Earlier I was able to retrieve more than 400 stocks using the same code.

We haven't done any changes from our side. You need to review your code at your end.

using local web server to get the request token and then generate the access token. I am able to generate the access token

As said you need to check your access_token generation part. Maybe hard code request_token and then debug once. Something like:
1> Manually copy request_token generated post successful login from your local server URL.
2> Paste that request_token to generate_session along with API secret and check, if it successfully authenticates.

data = kite.generate_session("paste request_token_here", api_secret="your_secret")
print(data)