Deployment of a web app created in Django in heroku fails.

To deploy the web app created in Django in heroku

 git push herokumain

The following error occurred while trying to:

"""Omitted""

remote: 
To https://git.heroku.com/hogehoge.git
 ! [remote rejected] main->main (pre-receive hook decremented)
error: failed to push some refs to 'https://git.heroku.com/hogehoge.git'

After a lot of research, I found the following article
I tried, but I still get the same error.

[Django] Error encountered during heroku deployment No. 1-Qiita

What other things do you think are missing?