openprojectを取得したものを、殆どいじらずにherokuにデプロイしてもエラーになる

openprojectをgithubからcloneしたものを
ローカルで多少いじって実行させることはできました。

以下は参照したリンクです。
SECRET_TOKENのセット
 angularのbuild

openprojectはangularを使っているのですが
この部分のherokuへのデプロイが失敗しているように見えます。

       Bundle completed (279.47s)
       Cleaning up the bundler cache.
-----> Installing node-v10.15.3-linux-x64
-----> Detecting rake tasks
-----> Preparing app for Rails asset pipeline
       Running: rake assets:precompile
       Linking frontend plugins
       npm run build
       W, [2019-11-30T00:15:10.435225 #3369]  WARN -- : hook registered
       Cleaning linked target directory /tmp/build_219547372df53486f0a518a5b642660e/frontend/src/app/modules/plugins/linked
       Linking frontend of OpenProject plugin openproject-avatars to /tmp/build_219547372df53486f0a518a5b642660e/frontend/src/app/modules/plugins/linked/openproject-avatars.
       Linking frontend of OpenProject plugin openproject-costs to /tmp/build_219547372df53486f0a518a5b642660e/frontend/src/app/modules/plugins/linked/openproject-costs.
       Linking frontend of OpenProject plugin openproject-documents to /tmp/build_219547372df53486f0a518a5b642660e/frontend/src/app/modules/plugins/linked/openproject-documents.
       Regenerating frontend plugin registry /tmp/build_219547372df53486f0a518a5b642660e/frontend/src/app/modules/plugins/linked-plugins.module.ts.
       Building angular frontend
       rake aborted!
       Failed to compile angular frontend: 127
       /tmp/build_219547372df53486f0a518a5b642660e/lib/tasks/assets.rake:66:in `block (4 levels) in <top (required)>'
       /tmp/build_219547372df53486f0a518a5b642660e/lib/tasks/assets.rake:65:in `block (3 levels) in <top (required)>'
       /tmp/build_219547372df53486f0a518a5b642660e/lib/tasks/assets.rake:64:in `chdir'
       /tmp/build_219547372df53486f0a518a5b642660e/lib/tasks/assets.rake:64:in `block (2 levels) in <top (required)>'
       /tmp/build_219547372df53486f0a518a5b642660e/vendor/bundle/ruby/2.6.0/gems/rake-13.0.1/exe/rake:27:in `<top (required)>'
       Tasks: TOP => assets:precompile => assets:compile_environment => assets:prepare_op => assets:angular
       (See full trace by running task with --trace)
 !
 !     Precompiling assets failed.
 !
 !     Push rejected, failed to compile Ruby app.
 !     Push failed