After deploying Django apps to heroku, the app is not displayed.

[Alberto]

After deploying Django apps to heroku, the app is not displayed.
After deploying, open the app URL and
The following error occurred.

Application error
An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. You can do this from the Heroku CLI with the command
heroku logs --tail

When you confirm that you need to chuck the log
I found the following error, but I could not find a clear answer if I searched.
What causes this error (at=error code=H10 desc="App crashed")?
In addition, if you have a solution, you can advise.

2020-12-11T07:28:47.775779+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=hogehoge.herokuapp.com request_id=ea446ace-d220-4db4-bab8-4466266d8650 fwd="69.118.84.101" dyno= connect= service= status=503 bytes= protocol=https
2020-12-11T07:28:47.909678+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=hogehoge.herokuapp.com request_id=c5b7a954-6d34-4a6e-87e1-2428df78ae29 fwd="69.118.84.101" dyno= connect= service= status=503 bytes= protocol=https
2020-12-11T07:04:39.534550+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=hogehoge.herokuapp.com request_id=58dbe69a-0704-44f8-aefb-ff777769a7a8 fwd="69.118.84.101" dyno= connect= service= status=503 bytes= protocol=https

2020-12-11T07:04:40.143720+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=hogehoge.herokuapp.com request_id=be70bdb3-5501-4f94-837f-785c694ef87e fwd="69.118.84.101" dyno= connect= service= status=503 bytes= protocol=https

[Bogopo]

I think the error code of the question is the timeout of the application crashed or startup.
https://devcenter.heroku.com/articles/error-codes#h10-app-crashed

To run an app on Heroku

• requirements.txt
• Procfile
• runtime.txt

There are three options: All, define the root of the repository.

requirements.txt

pip freeze > requirements.txt

requirements.txt execute the above command in the repository root.

Procfile

web: gunicorn myproject.wsgi

runtime.txt

python-3.9.0

Please write Procfile and runtime.txt.
Procfilemyproject.wsgiChange the project name.
The django server is not suitable for the operation environment, so it uses gunicorn.
Before creating requirements.txt, execute the following command:

pip install gunicorn

Link
https://devcenter.heroku.com/ja/articles/django-app-configuration
https://devcenter.heroku.com/ja/articles/deploying-python
https://devcenter.heroku.com/ja/articles/getting-started-with-python