Rails 7 (jsbundling-rails) building error (app platform)

I’m trying to deploy my rails 7 jsbundling , but I’ve an error on the build:

` [2022-02-28 11:56:29]        Bundle completed (221.15s) 

[2022-02-28 11:56:29]        Cleaning up the bundler cache.

[2022-02-28 11:56:30]        Removing bundler (2.1.4)

[2022-02-28 11:56:32] -----> Detecting rake tasks

[2022-02-28 11:56:42] -----> Precompiling assets

[2022-02-28 11:56:42]        Running: rake assets:precompile

[2022-02-28 11:56:49]        Yarn executable was not detected in the system.

[2022-02-28 11:56:49]        Download Yarn at https://yarnpkg.com/en/docs/install

[2022-02-28 11:56:49]        rake aborted!

[2022-02-28 11:56:49]        jsbundling-rails: Command build failed, ensure yarn is installed and "yarn build" runs without errors

[2022-02-28 11:56:49]        /layers/heroku_ruby/gems/vendor/bundle/ruby/3.0.0/gems/jsbundling-rails-1.0.2/lib/tasks/jsbundling/build.rake:5:in block (2 levels) in <main>'

[2022-02-28 11:56:49]        Tasks: TOP => assets:precompile => javascript:build

[2022-02-28 11:56:49]        (See full trace by running task with --trace)

[2022-02-28 11:56:49]  !

[2022-02-28 11:56:49]  !     Precompiling assets failed.

[2022-02-28 11:56:49]  !
[2022-02-28 11:56:49] ERROR: failed to build: exit status 1

[2022-02-28 11:56:55] 
[2022-02-28 11:56:55] For documentation on the buildpacks used to build your app, please see:

[2022-02-28 11:56:55]    Ruby: https://do.co/apps-buildpack-ruby
[2022-02-28 11:56:55] 

[2022-02-28 11:56:55]  ! Build failed (145)

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