error Command "webpack" not found.　というエラーのためHerokuへデプロイできない

前提・実現したいこと

Rails チュートリアル１章「1.5.2Herokuにデプロイする（1）」にて　

$ git push heroku main

とpushしたところ、
見出しに記載した
error Command "webpack" not found.
というエラーが出てしまいました。

発生している問題・エラーメッセージ

webpackerに問題があるようです
このエラーを解消しherokuへhello_appをデプロイしたいです。

cloud9
1error Command "webpack" not found.

該当のソースコード

git push heroku main を行った結果

cloud9
1remote:        I, [2022-02-15T07:43:40.032328 #995]  INFO -- : Writing /tmp/build_9c31f45d/public/assets/application-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css
2remote:        I, [2022-02-15T07:43:40.032834 #995]  INFO -- : Writing /tmp/build_9c31f45d/public/assets/application-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css.gz
3remote:        Compiling…
4remote:        Compilation failed:
5remote:        error Command "webpack" not found.
6remote:        
7remote:        yarn run v1.22.17
8remote:        info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
9remote:        
10remote: 
11remote:  !
12remote:  !     Precompiling assets failed.
13remote:  !
14remote:  !     Push rejected, failed to compile Ruby app.
15remote: 
16remote:  !     Push failed
17remote:  !
18remote:  ! ## Warning - The same version of this code has already been built: c6ece086db716bba11cb7628ce1f12bba063bca2
19remote:  !
20remote:  ! We have detected that you have triggered a build from source code with version c6ece086db716bba11cb7628ce1f12bba063bca2
21remote:  ! at least twice. One common cause of this behavior is attempting to deploy code from a different branch.
22remote:  !
23remote:  ! If you are developing on a branch and deploying via git you must run:
24remote:  !
25remote:  !     git push heroku <branchname>:main
26remote:  !
27remote:  ! This article goes into details on the behavior:
28remote:  !   https://devcenter.heroku.com/articles/duplicate-build-version
29remote: 
30remote: Verifying deploy...
31remote: 
32remote: !       Push rejected to calm-ravine-40757.
33remote: 
34To https://git.heroku.com/calm-ravine-40757.git
35 ! [remote rejected] main -> main (pre-receive hook declined)
36error: failed to push some refs to 'https://git.heroku.com/ファイル名

herokuのBuild Log

Heroku
1       Cleaning up the bundler cache.
2-----> Installing node-v16.13.1-linux-x64
3-----> Installing yarn-v1.22.17
4-----> Detecting rake tasks
5-----> Preparing app for Rails asset pipeline
6       Running: rake assets:precompile
7       yarn install v1.22.17
8       [1/4] Resolving packages...
9       [2/4] Fetching packages...
10       [3/4] Linking dependencies...
11       warning " > webpack-dev-server@4.7.4" has unmet peer dependency "webpack@^4.37.0 || ^5.0.0".
12       warning "webpack-dev-server > webpack-dev-middleware@5.3.1" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
13       [4/4] Building fresh packages...
14       Done in 3.09s.
15       I, [2022-02-15T07:43:40.032328 #995]  INFO -- : Writing /tmp/build_9c31f45d/public/assets/application-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css
16       I, [2022-02-15T07:43:40.032834 #995]  INFO -- : Writing /tmp/build_9c31f45d/public/assets/application-e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855.css.gz
17       Compiling…
18       Compilation failed:
19       error Command "webpack" not found.
20       
21       yarn run v1.22.17
22       info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
23       
24 !
25 !     Precompiling assets failed.
26 !
27 !     Push rejected, failed to compile Ruby app.
28 !     Push failed

heroku logsをターミナルで行った結果

cloud9
12022-02-15T07:43:41.000000+00:00 
2app[api]: Build failed -- check your build output: 
3https://dashboard.heroku.com/apps/17478130-4bba-4e1b-8351-16aeeaeeeb2e/activity/builds/c4eede60-ba6c-4553-a45d-47efeb24e1d0