Cannot push git repo to Heroku - ruby-on-rails

Question

I try to push my git repo to Heroku, but I get error:
remote: -----> Installing node-v12.16.2-linux-x64
remote: -----> Detecting rake tasks
remote:
remote: !
remote: ! Could not detect rake tasks
remote: ! ensure you can run `$ bundle exec rake -P` against your app
remote: ! and using the production group of your Gemfile.
remote: ! /tmp/build_641166cf/bin/rake:8:in `require': cannot load such file -- rake (LoadError)
remote: ! Push rejected, failed to compile Ruby app.
remote:
remote: ! Push failed
remote: !
remote: ! ## Warning - The same version of this code has already been built: 93a5bb6ab6e77c479f857031010316f9f372e20f
remote: !
remote: ! We have detected that you have triggered a build from source code with version 93a5bb6ab6e77c479f857031010316f9f372e20f
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 whispering-fortress-58873.
remote:
To https://git.heroku.com/whispering-fortress-58873.git
! [remote rejected] master -> master (pre-receive hook declined)
error: не удалось отправить некоторые ссылки в «https://git.heroku.com/whispering-fortress-58873.git»
How to fix it? I've been trying to fix this for two days now.
Ruby version: 2.7.2
Rails version: 5.2.4.4
Gem version: 3.1.4
Bundler version: 2.2.7

Answer 1

Checking error logs it seems that you need to push your branch to main
Try the following (or replace master with your current branch)
git push heroku master:main