Pushing to Heroku Failed

Я пытаюсь впервые развернуть свое приложение на Heroku и сталкиваюсь со следующей ошибкой при попытке push с помощью git:

Я также пробовал git push heroku HEAD:main и git push heroku master с теми же результатами. Это проблема ветки? Что еще может быть причиной этого?

C:\Users\New User\Downloads\django-modal-ajax-crud-main\django-modal-ajax-crud-main>git push heroku main
Enumerating objects: 185, done.
Counting objects: 100% (185/185), done.
Delta compression using up to 4 threads
Compressing objects: 100% (169/169), done.
Writing objects: 100% (185/185), 72.21 MiB | 1.29 MiB/s, done.
Total 185 (delta 33), reused 0 (delta 0), pack-reused 0
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Building on the Heroku-20 stack
remote: -----> Determining which buildpack to use for this app
remote: -----> Python app detected
remote: -----> Using Python version specified in runtime.txt
remote:  !     Requested runtime ("python-3.8.7") is not available for this stack (heroku-20).
remote:  !     Aborting.  More info: https://devcenter.heroku.com/articles/python-support
remote:  !     Push rejected, failed to compile Python app.
remote:
remote:  !     Push failed
remote:  !
remote:  ! ## Warning - The same version of this code has already been built: ed5e29f5eae1f6c87fe608824165f38e3146d5af
remote:  !
remote:  ! We have detected that you have triggered a build from source code with version ed5e29f5eae1f6c87fe608824165f38e3146d5af
remote:  ! at least twice. One common cause of this behavior is attempting to deploy code from a different branch.
remote:  !
remote:  ! If you are developing on a branch and deploying via git you must run:
remote:  !
remote:  !     git push heroku <branchname>:main
remote:  !
remote:  ! This article goes into details on the behavior:
remote:  !   https://devcenter.heroku.com/articles/duplicate-build-version
remote:
remote: Verifying deploy...
remote:
remote: !       Push rejected to fast-citadel-45516.
remote:
To https://git.heroku.com/fast-citadel-45516.git
 ! [remote rejected] main -> main (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/fast-citadel-45516.git'
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