ModuleNotFoundError: No module named 'main' in Flask application deployed on gcloud

Question

I am getting the error ModuleNotFoundError: No module named 'main'. I have a flask application deployed on gcloud.

The build was successful on gcloud. The url is given in the logs. But when i invoke the url, the logs shows the below error

ModuleNotFoundError: No module named 'main'

and i get 502 Bad gateway error

Any help is much appreciated.

Below are the respective files.

requirements.txt

flask flask_socketio flask_caching flask_cors gunicorn

cloudbuild.yaml

Install dependencies

• name: 'python:3.11' entrypoint: 'pip' args: ['install', '-r', 'requirements.txt']

• name: 'gcr.io/cloud-builders/gcloud' entrypoint: '/bin/sh'

  args:

  • '-c'
  • | gcloud app deploy app.yaml timeout: 1600s

app.yaml

runtime: python311

handlers:

• url: /static static_dir: static

• url: /.* script: | gunicorn -b :8081 app:app

** app.py **

`from flask import Flask
import sys
import os
from flask_socketio import SocketIO

    
# Create a Flask application
app = Flask(__name__)
socketio = SocketIO(app)

# Define a route for the homepage
@app.route('/')
def home():
    return 'Hello, World! This is the homepage.'

# Define a route for a custom endpoint
@app.route('/about')
def about():
    return 'This is the about page.'

if __name__ == '__main__':
    host = os.environ.get("HOST", "0.0.0.0")
    socketio.run(app, host="0.0.0.0", port=8081)`

I have tried building and deploying on gcloud and I expect to see my flask application running. Any help is much appreciated!