Login Trouble in accesing Fyers V3 API. JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Dear Fyers Developer Community,

I hope this message finds you well. I'm reaching out to seek assistance with a coding issue I've encountered, and I'd greatly appreciate any guidance or suggestions you may have.

JSONDecodeError: Expecting value: line 1 column 1 (char 0)

from fyers_apiv3 import fyersModel

"""
In order to get started with Fyers API we would like you to do the following things first.
1. Checkout our API docs :   https://myapi.fyers.in/docsv3
2. Create an APP using our API dashboard :   https://myapi.fyers.in/dashboard/

Once you have created an APP you can start using the below SDK
"""

#### Generate an authcode and then make a request to generate an accessToken (Login Flow)
## app_secret key which you got after creating the app

grant_type = "authorization_code"                  ## The grant_type always has to be "authorization_code"
response_type = "code"                             ## The response_type always has to be "code"
state = "sample"                                   ##  The state field here acts as a session manager. you will be sent with the state field after successfull generation of auth_code


### Connect to the sessionModel object here with the required input parameters
appSession = fyersModel.SessionModel(client_id = client_id, redirect_uri = redirect_uri,response_type=response_type,state=state,secret_key=secret_key,grant_type=grant_type)

# ## Make  a request to generate_authcode object this will return a login url which you need to open in your browser from where you can get the generated auth_code
generateTokenUrl = appSession.generate_authcode()
generateTokenUrl

from datetime import datetime, timedelta, date
from  time import sleep
import os
import pyotp
import requests
import json
import math
import pytz
from urllib.parse import parse_qs,urlparse
import warnings
import pandas as pd


pd.set_option('display.max_columns', None)
warnings.filterwarnings('ignore')

import base64
def getEncodedString(string):
    string = str(string)
    base64_bytes = base64.b64encode(string.encode("ascii"))
    return base64_bytes.decode("ascii")




URL_SEND_LOGIN_OTP="https://api-t2.fyers.in/vagator/v2/send_login_otp_v2"
res = requests.post(url=URL_SEND_LOGIN_OTP, json={"fy_id":getEncodedString(FY_ID),"app_id":"2"}).json()
print(res)