【学習メモ】ぶち当たったエラー集 RailsアプリをHerokuへのデプロイ

目次

• 背景
• 実装環境
• ぶち当たったエラー
• 学び
• 参考
• 今回のエラーメッセージ（修正前）

背景

ポートフォリオを、仮の状態でもいいからデプロイしてWebサイトに公開することを挑戦。しかし幾度のエラーに直面して心折れそうになったが、問題解決できたので、その過程を整理して自分で理解し直す目的と、同じような躓きをしてしまった方のためにも、参考材料となればと思い、公開します。

実装環境

• Rails:5.2.4
• DB:PostgreSQL　※デフォルトでPostgreSQLを採用
• Rubyのbuildpackはインストール済 (heroku create --buildpack https://github.com/heroku/heroku-buildpack-ruby.git) ※buildpackについては、Qiitaの記事と、Heroku公式ガイドを参考に実装。これができないとデプロイは難しいかも？

ぶち当たったエラー

1.Your Gemfile lists the gem pg (>= 0.18, < 2.0) more than once.

git push heroku masterしたログを辿ってみると、、、

terminal

（省略）
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Ruby app detected
remote: -----> Installing bundler 2.0.2
remote: -----> Removing BUNDLED WITH version in the Gemfile.lock
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.6.5
remote: -----> Installing dependencies using bundler 2.0.2
remote:        Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
remote:        Your Gemfile lists the gem pg (>= 0.18, < 2.0) more than once.
remote:        You should probably keep only one of them.
remote:        Remove any duplicate entries and specify the gem only once (per group).
remote:        While it's not a problem now, it could cause errors if you change the version of one of them later.
（省略）

の中の、ここが問題。

terminal

remote:        Your Gemfile lists the gem pg (>= 0.18, < 2.0) more than once.
remote:        You should probably keep only one of them.

【意味】
Postgresqlが2つあるから、どちらか1つだけ残しておけよ（＝1個消しなさい）

【これが発生した原因】
udemyの教材を参考に、自分で記述していたことに気づく。

group :production do
gem 'pg', '>= 0.18', '< 2.0'
end

【試したこと・実装方法】
デフォルトでPostgreSQL採用しているので上記コードを消去してgit commit。

#masterブランチにて
git add -A
git commit -m “Message”

で、この表示はなくなり解決。

2.remote: ! Precompiling assets failed.

【意味】
コンパイルの設定に失敗した

【原因】
コンパイルの設定を行うためのgem, コードがなかった

【試したこと・実装方法】
Qiita記事を参考に、下記の通り記述。

config/environments/production.rb

config.assets.initialize_on_precompile = false

これだけではうまく行かなかったので、上記コードをそのままググり、スタックオーバーフローの記事を発見。これを参考に、下記の通り記述。

①

config/environments/production.rb

  config.assets.js_compressor = :uglifier

②

Gemfile

gem 'uglifier'

これでこの問題について解決。

3.error: failed to push some refs to 'https://git.heroku.com/（アプリ名）.git'

【意味】
エラー：一部の参照を、https:（アプリ名）.gitへのpushできなかった

【原因】
リモートとローカルでコミットが分かれてしまい単純にはマージできない状況になってしまったため（その状況が起こるのは、ローカルでcommitしたけどリモートにpushし忘れた、場合が考えられそう）

【試したこと・実装方法】
VScodeでCommit履歴を確認。ローカルリポジトリのブランチXを、マスターブランチにmergeし、リモートリポジトリにpull requestして、git merge ブランチXを実行。

実行できたことを確認し、1.,2.の問題が片付いた上で、

terminal

bundle install
git add -A
git commit -m “Message”
git push heroku master

したところ、、、

terminal

(省略)
remote:        https://quiet-escarpment-59252.herokuapp.com/ deployed to Heroku
remote: 
remote: Verifying deploy... done.
To https://git.heroku.com/quiet-escarpment-59252.git
 * [new branch]      master -> master

そして、

terminal

user$ heroku run rails db:migrate

学び

今まで、目に見えてエラーと表示されている箇所ばかりログを読んでいたのですが、実行された内容全部確認してみると、「目立ってないけど実はエラーなんです」という内容が結構あるんだなぁと気付きました。

そして、ログを辿りながら「ん？」ってなったところを上から徹底的に調査して1つずつ潰していくのが（基本中の基本ですが）大事だと学びました。

某現役エンジニアの方曰く「上から順に潰していくゲームだ」とおっしゃっていました。地道な作業ですが、ゲーム感覚で楽しみながら今後も開発していきたいと思います。

参考

Herokuにpushしたらprecompile assets faild.が。pushできたと思ったらApplication Errorが。解決するまで。

git push時にerror: failed to push some refs toとエラーがでる

git push heroku masterで発生するエラー（ Precompiling assets failed., error: failed to push some refs to）について

heroku　git push heroku masterが拒まれた話

Heroku build fails on uglifier

our Gemfile lists the gem more than once. could cause errors

Heroku:Buildpackエラーでハマった

今回のエラーメッセージ（修正前） ※超長文のため注意

terminal

USER:[アプリ名] user$ git push heroku master
Enumerating objects: 209, done.
Counting objects: 100% (209/209), done.
Delta compression using up to 8 threads
Compressing objects: 100% (178/178), done.
Writing objects: 100% (209/209), 181.92 KiB | 7.28 MiB/s, done.
Total 209 (delta 29), reused 105 (delta 11)
remote: Compressing source files... done.
remote: Building source:
remote: 
remote: -----> Ruby app detected
remote: -----> Installing bundler 2.0.2
remote: -----> Removing BUNDLED WITH version in the Gemfile.lock
remote: -----> Compiling Ruby/Rails
remote: -----> Using Ruby version: ruby-2.6.5
remote: -----> Installing dependencies using bundler 2.0.2
remote:        Running: bundle install --without development:test --path vendor/bundle --binstubs vendor/bundle/bin -j4 --deployment
remote:        Your Gemfile lists the gem pg (>= 0.18, < 2.0) more than once.
remote:        You should probably keep only one of them.
remote:        Remove any duplicate entries and specify the gem only once (per group).
remote:        While it's not a problem now, it could cause errors if you change the version of one of them later.
remote:        The dependency tzinfo-data (>= 0) will be unused by any of the platforms Bundler is installing for. Bundler is installing for ruby but the dependency is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those platforms to the bundle, run `bundle lock --add-platform x86-mingw32 x86-mswin32 x64-mingw32 java`.
remote:        Fetching gem metadata from https://rubygems.org/.........
remote:        Fetching rake 13.0.1
remote:        Installing rake 13.0.1
remote:        Fetching concurrent-ruby 1.1.6
remote:        Fetching minitest 5.14.1
remote:        Fetching thread_safe 0.3.6
remote:        Installing thread_safe 0.3.6
remote:        Installing concurrent-ruby 1.1.6
remote:        Installing minitest 5.14.1
remote:        Fetching builder 3.2.4
remote:        Fetching erubi 1.9.0
remote:        Installing builder 3.2.4
remote:        Installing erubi 1.9.0
remote:        Fetching mini_portile2 2.4.0
remote:        Installing mini_portile2 2.4.0
remote:        Fetching crass 1.0.6
remote:        Installing crass 1.0.6
remote:        Fetching rack 2.2.2
remote:        Fetching nio4r 2.5.2
remote:        Installing rack 2.2.2
remote:        Installing nio4r 2.5.2 with native extensions
remote:        Fetching websocket-extensions 0.1.5
remote:        Installing websocket-extensions 0.1.5
remote:        Fetching mini_mime 1.0.2
remote:        Installing mini_mime 1.0.2
remote:        Fetching arel 9.0.0
remote:        Installing arel 9.0.0
remote:        Fetching mimemagic 0.3.5
remote:        Installing mimemagic 0.3.5
remote:        Fetching execjs 2.7.0
remote:        Installing execjs 2.7.0
remote:        Fetching bcrypt 3.1.13
remote:        Fetching msgpack 1.3.3
remote:        Installing bcrypt 3.1.13 with native extensions
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remote:        Fetching popper_js 1.16.0
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remote:        Fetching method_source 1.0.0
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remote:        Fetching thor 1.0.1
remote:        Installing thor 1.0.1
remote:        Fetching ffi 1.13.0
remote:        Installing ffi 1.13.0 with native extensions
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remote:        Installing tilt 2.0.10
remote:        Using bundler 2.0.2
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remote:        Fetching multi_json 1.14.1
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remote:        Fetching kaminari-core 1.2.1
remote:        Installing kaminari-core 1.2.1
remote:        Fetching pg 1.2.3
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remote:        Fetching turbolinks-source 5.2.0
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remote:        Fetching sprockets-rails 3.2.1
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remote:        Fetching rails 5.2.4.3
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remote:        Fetching momentjs-rails 2.20.1
remote:        Installing jquery-rails 4.4.0
remote:        Installing momentjs-rails 2.20.1
remote:        Fetching rails-i18n 5.1.3
remote:        Installing rails-i18n 5.1.3
remote:        Fetching slim-rails 3.2.0
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remote:        Fetching webpacker 4.2.2
remote:        Installing webpacker 4.2.2
remote:        Fetching devise 4.7.1
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remote:        Fetching kaminari-bootstrap 3.0.1
remote:        Installing kaminari-bootstrap 3.0.1
remote:        Fetching devise-i18n 1.9.1
remote:        Installing devise-i18n 1.9.1
remote:        Fetching sassc-rails 2.1.2
remote:        Installing sassc-rails 2.1.2
remote:        Fetching bootstrap 4.5.0
remote:        Fetching sass-rails 6.0.0
remote:        Installing sass-rails 6.0.0
remote:        Installing bootstrap 4.5.0
remote:        Bundle complete! 38 Gemfile dependencies, 90 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 i18n:
remote:        
remote:        HEADS UP! i18n 1.1 changed fallbacks to exclude default locale.
remote:        But that may break your application.
remote:        
remote:        If you are upgrading your Rails application from an older version of Rails:
remote:        
remote:        Please check your Rails app for 'config.i18n.fallbacks = true'.
remote:        If you're using I18n (>= 1.1.0) and Rails (< 5.2.2), this should be
remote:        'config.i18n.fallbacks = [I18n.default_locale]'.
remote:        If not, fallbacks will be broken in your app by I18n 1.1.x.
remote:        
remote:        If you are starting a NEW Rails application, you can ignore this notice.
remote:        
remote:        For more info see:
remote:        https://github.com/svenfuchs/i18n/releases/tag/v1.1.0
remote:        
remote:        Bundle completed (234.22s)
remote:        Cleaning up the bundler cache.
remote: -----> Installing node-v10.15.3-linux-x64
remote: -----> Installing yarn-v1.16.0
remote: -----> Detecting rake tasks
remote: -----> Preparing app for Rails asset pipeline
remote:        Running: rake assets:precompile
remote:        yarn install v1.16.0
remote:        [1/4] Resolving packages...
remote:        [2/4] Fetching packages...
remote:        info fsevents@2.1.3: The platform "linux" is incompatible with this module.
remote:        info "fsevents@2.1.3" is an optional dependency and failed compatibility check. Excluding it from installation.
remote:        info fsevents@1.2.13: The platform "linux" is incompatible with this module.
remote:        info "fsevents@1.2.13" is an optional dependency and failed compatibility check. Excluding it from installation.
remote:        [3/4] Linking dependencies...
remote:        warning " > webpack-dev-server@3.11.0" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
remote:        warning "webpack-dev-server > webpack-dev-middleware@3.7.2" has unmet peer dependency "webpack@^4.0.0".
remote:        [4/4] Building fresh packages...
remote:        Done in 27.11s.
remote:        yarn install v1.16.0
remote:        [1/4] Resolving packages...
remote:        [2/4] Fetching packages...
remote:        info fsevents@2.1.3: The platform "linux" is incompatible with this module.
remote:        info "fsevents@2.1.3" is an optional dependency and failed compatibility check. Excluding it from installation.
remote:        info fsevents@1.2.13: The platform "linux" is incompatible with this module.
remote:        info "fsevents@1.2.13" is an optional dependency and failed compatibility check. Excluding it from installation.
remote:        [3/4] Linking dependencies...
remote:        warning " > webpack-dev-server@3.11.0" has unmet peer dependency "webpack@^4.0.0 || ^5.0.0".
remote:        warning "webpack-dev-server > webpack-dev-middleware@3.7.2" has unmet peer dependency "webpack@^4.0.0".
remote:        [4/4] Building fresh packages...
remote:        Done in 5.73s.
remote:        rake aborted!
remote:        LoadError: cannot load such file -- uglifier

remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:34:in `require'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in `block in require'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:257:in `load_dependency'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in `require'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/autoload/uglifier.rb:2:in `<main>'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `require'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:23:in `block in require_with_bootsnap_lfi'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/loaded_features_index.rb:92:in `register'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:22:in `require_with_bootsnap_lfi'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/bootsnap-1.4.6/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:31:in `require'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in `block in require'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:257:in `load_dependency'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/activesupport-5.2.4.3/lib/active_support/dependencies.rb:291:in `require'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/uglifier_compressor.rb:43:in `initialize
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/uglifier_compressor.rb:26:in `new'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/uglifier_compressor.rb:26:in `instance'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/uglifier_compressor.rb:30:in `call'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:84:in `call_processor
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:65:in `reverse_each'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:65:in `call_processors'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/loader.rb:182:in `load_from_unloaded'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/loader.rb:59:in `block in load'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/loader.rb:335:in `fetch_asset_from_dependency_cache'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/loader.rb:43:in `load'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/cached_environment.rb:44:in `load'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/bundle.rb:32:in `block in call'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/bundle.rb:31:in `call'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:84:in `call_processor
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:66:in `block in call_processors'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:65:in `reverse_each'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/processor_utils.rb:65:in `call_processors'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/loader.rb:182:in `load_from_unloaded'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/loader.rb:59:in `block in load'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/loader.rb:335:in `fetch_asset_from_dependency_cache'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/loader.rb:43:in `load'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/cached_environment.rb:44:in `load'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/base.rb:81:in `find_asset'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/base.rb:88:in `find_all_linked_assets'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/sprockets-4.0.0/lib/sprockets/manifest.rb:125:in `block (2 levels) in find'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/safe_task_executor.rb:24:in `block in execute'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:41:in `block in synchronize'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:41:in `synchronize'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/synchronization/mutex_lockable_object.rb:41:in `synchronize'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/safe_task_executor.rb:19:in `execute'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/promise.rb:563:in `block in realize'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:353:in `run_task'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:342:in `block (3 levels) in create_worker'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:325:in `loop'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:325:in `block (2 levels) in create_worker'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:324:in `catch'
remote:        /tmp/build_766ffab2466e42f825b9e77071bc1f96/vendor/bundle/ruby/2.6.0/gems/concurrent-ruby-1.1.6/lib/concurrent-ruby/concurrent/executor/ruby_thread_pool_executor.rb:324:in `block in create_worker'
remote:        Tasks: TOP => assets:precompile
remote:        (See full trace by running task with --trace)
remote:  !
remote:  !     Precompiling assets failed.
remote:  !
remote:  !     Push rejected, failed to compile Ruby app.
remote: 
remote:  !     Push failed
remote: Verifying deploy...
remote: 
remote: !       Push rejected to [アプリ名]
remote: 
To https://git.heroku.com/[アプリ名].git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to '[アプリ名].git'