[Python] Getting 'Catalyst headers are empty' error from my Catalyst Advanced I/O function

I am using Python Flask in my Zoho Catalyst Advanced I/O function where I initialized Catalyst Python SDK and when I tried testing the function using catalyst serve command I am getting the below error:

{"error": "CatalystAppError("{'code': 'FATAL ERROR', 'message': 'Catalyst headers are empty'}")"}
​

I am getting the same error even after I deployed my Advanced I/O function to Catalyst Development environment using catalyst deploy command.

I also attached my function code snippet below for reference:

import logging
from flask import Flask, request, make_response, jsonify
import zcatalyst_sdk


app = Flask(__name__)


@app.route("/server/test/", methods=["GET"])
def initialize():
catalyst_app = zcatalyst_sdk.initialize(req=request)

response_data = {
"status": "success",
"data": {"Catalyst App Initialized"}
}

response = make_response(jsonify(response_data), 200)
return response

if __name__ == "__main__":
app.run(debug=True, port=3000)

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