Cloud9を利用したHerokuへのデプロイが出来ません。(Railsチュートリアル)

Question

Railsチュートリアルを進めています。Cloud9を使ってのHerokuへのデプロイがうまくできません。

bundleのバージョンが違うという例を見つけ確認しましたが、Heroku のバージョン(Bundle2.3.10)と同じになっています。
yarnのインストールも問題ないように思えます。
Herokuへのログインも問題ありません。
git commitも出来ています。
エラー文に書かれている
git push heroku <branchname>:main
も実行してみましたがうまくいきませんでした。
(git branchの結果は* masterになります。
git push heroku <master>:main
と書き換えてみてもやってみましたがだめでした。)

heroku createし直してみましたができず...。
全くの初心者なので、お力をお借りしたいです。

$ git push heroku master
Total 0 (delta 0), reused 0 (delta 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:  !     Warning: Multiple default buildpacks reported the ability to handle this app. The first buildpack in the list below will be used.
remote:                         Detected buildpacks: Ruby,Node.js
remote:                         See https://devcenter.heroku.com/articles/buildpacks#buildpack-detect-order
remote: -----> Ruby app detected
remote: -----> Installing bundler 2.3.10
remote: -----> Removing BUNDLED WITH version in the Gemfile.lock
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-3.0.3
remote: -----> Installing dependencies using bundler 2.3.10
remote:        Running: BUNDLE_WITHOUT='development:test' BUNDLE_PATH=vendor/bundle BUNDLE_BIN=vendor/bundle/bin BUNDLE_DEPLOYMENT=1 bundle install -j4
remote:        Fetching gem metadata from https://rubygems.org/..........
remote:        Fetching rake 12.3.3
remote:        Installing rake 12.3.3
remote:        Fetching concurrent-ruby 1.1.10
remote:        Fetching minitest 5.15.0
remote:        Fetching zeitwerk 2.5.4
remote:        Fetching thread_safe 0.3.6
remote:        Installing zeitwerk 2.5.4
remote:        Installing thread_safe 0.3.6
remote:        Installing concurrent-ruby 1.1.10
remote:        Installing minitest 5.15.0
remote:        Fetching builder 3.2.4
remote:        Fetching erubi 1.10.0
remote:        Installing builder 3.2.4
remote:        Installing erubi 1.10.0
remote:        Fetching racc 1.6.0
remote:        Fetching crass 1.0.6
remote:        Fetching rack 2.2.3
remote:        Fetching nio4r 2.5.8
remote:        Installing racc 1.6.0 with native extensions
remote:        Installing nio4r 2.5.8 with native extensions
remote:        Installing crass 1.0.6
remote:        Installing rack 2.2.3
remote:        Fetching websocket-extensions 0.1.5
remote:        Installing websocket-extensions 0.1.5
remote:        Fetching marcel 1.0.2
remote:        Fetching mini_mime 1.1.2
remote:        Installing mini_mime 1.1.2
remote:        Installing marcel 1.0.2
remote:        Using bundler 2.3.10
remote:        Fetching msgpack 1.5.1
remote:        Fetching ffi 1.15.5
remote:        Installing msgpack 1.5.1 with native extensions
remote:        Installing ffi 1.15.5 with native extensions
remote:        Fetching method_source 1.0.0
remote:        Installing method_source 1.0.0
remote:        Fetching pg 1.1.4
remote:        Installing pg 1.1.4 with native extensions
remote:        Fetching thor 1.2.1
remote:        Installing thor 1.2.1
remote:        Fetching rb-fsevent 0.11.1
remote:        Installing rb-fsevent 0.11.1
remote:        Fetching tilt 2.0.10
remote:        Installing tilt 2.0.10
remote:        Fetching turbolinks-source 5.2.0
remote:        Installing turbolinks-source 5.2.0
remote:        Fetching i18n 1.10.0
remote:        Installing i18n 1.10.0
remote:        Fetching tzinfo 1.2.9
remote:        Installing tzinfo 1.2.9
remote:        Fetching rack-test 1.1.0
remote:        Installing rack-test 1.1.0
remote:        Fetching rack-proxy 0.7.2
remote:        Installing rack-proxy 0.7.2
remote:        Fetching sprockets 3.7.2
remote:        Installing sprockets 3.7.2
remote:        Fetching websocket-driver 0.7.5
remote:        Installing websocket-driver 0.7.5 with native extensions
remote:        Fetching mail 2.7.1
remote:        Installing mail 2.7.1
remote:        Fetching nokogiri 1.13.6 (x86_64-linux)
remote:        Installing nokogiri 1.13.6 (x86_64-linux)
remote:        Fetching puma 4.3.6
remote:        Installing puma 4.3.6 with native extensions
remote:        Fetching turbolinks 5.2.0
remote:        Installing turbolinks 5.2.0
remote:        Fetching activesupport 6.0.4
remote:        Installing activesupport 6.0.4
remote:        Fetching bootsnap 1.10.3
remote:        Installing bootsnap 1.10.3 with native extensions
remote:        Fetching loofah 2.18.0
remote:        Installing loofah 2.18.0
remote:        Fetching rails-dom-testing 2.0.3
remote:        Installing rails-dom-testing 2.0.3
remote:        Fetching globalid 1.0.0
remote:        Installing globalid 1.0.0
remote:        Fetching activemodel 6.0.4
remote:        Installing activemodel 6.0.4
remote:        Fetching jbuilder 2.9.1
remote:        Installing jbuilder 2.9.1
remote:        Fetching rails-html-sanitizer 1.4.2
remote:        Installing rails-html-sanitizer 1.4.2
remote:        Fetching activejob 6.0.4
remote:        Installing activejob 6.0.4
remote:        Fetching activerecord 6.0.4
remote:        Installing activerecord 6.0.4
remote:        Fetching actionview 6.0.4
remote:        Installing actionview 6.0.4
remote:        Fetching actionpack 6.0.4
remote:        Installing actionpack 6.0.4
remote:        Fetching actioncable 6.0.4
remote:        Installing actioncable 6.0.4
remote:        Fetching activestorage 6.0.4
remote:        Installing activestorage 6.0.4
remote:        Fetching actionmailer 6.0.4
remote:        Installing actionmailer 6.0.4
remote:        Fetching railties 6.0.4
remote:        Installing railties 6.0.4
remote:        Fetching sprockets-rails 3.4.2
remote:        Installing sprockets-rails 3.4.2
remote:        Fetching actionmailbox 6.0.4
remote:        Installing actionmailbox 6.0.4
remote:        Fetching actiontext 6.0.4
remote:        Installing actiontext 6.0.4
remote:        Fetching webpacker 4.0.7
remote:        Installing webpacker 4.0.7
remote:        Fetching rails 6.0.4
remote:        Installing rails 6.0.4
remote:        Fetching rb-inotify 0.10.1
remote:        Installing rb-inotify 0.10.1
remote:        Fetching sass-listen 4.0.0
remote:        Installing sass-listen 4.0.0
remote:        Fetching sass 3.7.4
remote:        Installing sass 3.7.4
remote:        Fetching sass-rails 5.1.0
remote:        Installing sass-rails 5.1.0
remote:        Bundle complete! 18 Gemfile dependencies, 58 gems now installed.
remote:        Gems in the groups 'development' and 'test' were not installed.
remote:        Bundled gems are installed into `./vendor/bundle`
remote:        Post-install message from sass:
remote:        
remote:        Ruby Sass has reached end-of-life and should no longer be used.
remote:        
remote:        * If you use Sass as a command-line tool, we recommend using Dart Sass, the new
remote:          primary implementation: https://sass-lang.com/install
remote:        
remote:        * If you use Sass as a plug-in for a Ruby web framework, we recommend using the
remote:          sassc gem: https://github.com/sass/sassc-ruby#readme
remote:        
remote:        * For more details, please refer to the Sass blog:
remote:          https://sass-lang.com/blog/posts/7828841
remote:        
remote:        Bundle completed (23.49s)
remote:        Cleaning up the bundler cache.
remote: -----> Installing node-v16.13.1-linux-x64
remote: -----> Installing yarn-v1.22.17
remote: -----> Detecting rake tasks
remote: -----> Preparing app for Rails asset pipeline
remote:        Running: rake assets:precompile
remote:        yarn install v1.22.17
remote:        [1/4] Resolving packages...
remote:        [2/4] Fetching packages...
remote:        [3/4] Linking dependencies...
remote:        warning " > webpack-dev-server@4.9.0" has unmet peer dependency "webpack@^4.37.0 || ^5.0.0".
remote:        warning "webpack-dev-server > webpack-dev-middleware@5.3.3" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
remote:        [4/4] Building fresh packages...
remote:        Done in 2.34s.
remote:        I, [2022-05-24T03:42:44.495635 #951]  INFO -- : Writing /tmp/build_6696bc9d/public/assets/application-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css
remote:        I, [2022-05-24T03:42:44.496760 #951]  INFO -- : Writing /tmp/build_6696bc9d/public/assets/application-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css.gz
remote:        Compiling…
remote:        Compilation failed:
remote:        error Command "webpack" not found.
remote:        
remote:        yarn run v1.22.17
remote:        info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
remote:        
remote: 
remote:  !
remote:  !     Precompiling assets failed.
remote:  !
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: f8c9070ec0c5934f5ecf92a8ea1915c7faf59501
remote:  !
remote:  ! We have detected that you have triggered a build from source code with version f8c9070ec0c5934f5ecf92a8ea1915c7faf59501
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 rocky-sea-62354.
remote: 
To https://git.heroku.com/rocky-sea-62354.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/rocky-sea-62354.git'