python - Failed to find attribute 'app' in '__main__'

Question

Im trying to deploy a web app using flask to heroku using gunicorn. I've been trying for roughly 2 days but with no luck. I currently have this error:

Failed to find attribute 'app' in '__main__'.

I know the error is saying that it couldn't find app in __main__.py but I don't know why it couldn't find it as app is in __main__.py, as you can see below.

'Procfile'

web: gunicorn __main__:app

'__main__.py' (first 9 lines and last 2 lines)

from flask import Flask, render_template, redirect, request, session, g
import random
import requests
import mysql.connector

from oauth import Oauth
from oauth2 import Oauth2

app = Flask(__name__)

# 200 removed lines of flask code that powers the backend goes here

if __name__ == "__main__":
    app.run()

This is what my directly looks like if it helps:

web
-static
-templates
-__main__.py
-oauth.py
-oauth2.py
-Procfile
-requirements.txt

Here is the full error logs from heroku

2021-01-27T12:55:26.211031+00:00 app[web.1]: [2021-01-27 12:55:26 +0000] [9] [INFO] Booting worker with pid: 9
2021-01-27T12:55:26.213834+00:00 app[web.1]: Failed to find attribute 'app' in '__main__'.
2021-01-27T12:55:26.214015+00:00 app[web.1]: [2021-01-27 12:55:26 +0000] [9] [INFO] Worker exiting (pid: 9)
2021-01-27T12:55:26.223266+00:00 app[web.1]: [2021-01-27 12:55:26 +0000] [10] [INFO] Booting worker with pid: 10
2021-01-27T12:55:26.226404+00:00 app[web.1]: Failed to find attribute 'app' in '__main__'.
2021-01-27T12:55:26.226731+00:00 app[web.1]: [2021-01-27 12:55:26 +0000] [10] [INFO] Worker exiting (pid: 10)
2021-01-27T12:55:26.359501+00:00 app[web.1]: [2021-01-27 12:55:26 +0000] [4] [INFO] Shutting down: Master
2021-01-27T12:55:26.359767+00:00 app[web.1]: [2021-01-27 12:55:26 +0000] [4] [INFO] Reason: App failed to load.
2021-01-27T12:55:26.447672+00:00 heroku[web.1]: Process exited with status 4
2021-01-27T12:55:26.511220+00:00 heroku[web.1]: State changed from starting to crashed

It runs fine without gunicorn on localhost on my laptop but not hosted on heroku with gunicorn.

question from:https://stackoverflow.com/questions/65919888/failed-to-find-attribute-app-in-main

Answer 1

Waitting for answers