Railsの全てのコマンドでsprockets-3.7.1のcan't dup NilClassエラーが出る

Question

railsでbundle install までした後にrails generateやrails s を実行したのですが、全て
[ルートdirectory]/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/utils.rb:40:in `dup': can't dup NilClass (TypeError)

のエラーで止まってしまい実行できません。

rubyは2.4.0-devで
railsは5.0.1です

Gemfileは以下です

source 'https://rubygems.org'

gem 'rails',        '5.0.1'
gem 'puma',         '3.4.0'
gem 'sass-rails',   '5.0.6'
gem 'uglifier',     '3.0.0'
gem 'coffee-rails', '4.2.1'
gem 'jquery-rails', '4.1.1'
gem 'turbolinks',   '5.0.1'
gem 'jbuilder',     '2.4.1'

group :development, :test do
  gem 'sqlite3', '1.3.11'
  gem 'byebug',  '9.0.0', platform: :mri
end

group :development do
  gem 'web-console',           '3.1.1'
  gem 'listen',                '3.0.8'
  gem 'spring',                '1.7.2'
  gem 'spring-watcher-listen', '2.0.0'
end

group :test do
  gem 'rails-controller-testing', '0.1.1'
  gem 'minitest-reporters',       '1.1.9'
  gem 'guard',                    '2.13.0'
  gem 'guard-minitest',           '2.4.4'
end

group :production do
  gem 'pg', '0.18.4'
end

rails s
/Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:51: warning: constant ::Fixnum is deprecated
/Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/activesupport-5.0.1/lib/active_support/xml_mini.rb:52: warning: constant ::Bignum is deprecated
/Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/utils.rb:40:in `dup': can't dup NilClass (TypeError)
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/utils.rb:40:in `hash_reassoc1'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/utils.rb:65:in `hash_reassoc'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/transformers.rb:142:in `compute_transformers!'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processing.rb:216:in `register_config_processor'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets/processing.rb:51:in `register_preprocessor'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets.rb:97:in `<module:Sprockets>'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/sprockets-3.7.1/lib/sprockets.rb:9:in `<top (required)>'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/sprockets-rails-3.2.0/lib/sprockets/railtie.rb:6:in `require'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/sprockets-rails-3.2.0/lib/sprockets/railtie.rb:6:in `<top (required)>'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/railties-5.0.1/lib/rails/all.rb:14:in `require'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/railties-5.0.1/lib/rails/all.rb:14:in `block in <top (required)>'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/railties-5.0.1/lib/rails/all.rb:12:in `each'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/railties-5.0.1/lib/rails/all.rb:12:in `<top (required)>'
	from /Users/sonekenichiro/development/ghiiko/test_app/config/application.rb:3:in `require'
	from /Users/sonekenichiro/development/ghiiko/test_app/config/application.rb:3:in `<top (required)>'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/railties-5.0.1/lib/rails/commands/commands_tasks.rb:88:in `require'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/railties-5.0.1/lib/rails/commands/commands_tasks.rb:88:in `block in server'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/railties-5.0.1/lib/rails/commands/commands_tasks.rb:85:in `tap'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/railties-5.0.1/lib/rails/commands/commands_tasks.rb:85:in `server'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/railties-5.0.1/lib/rails/commands/commands_tasks.rb:49:in `run_command!'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/railties-5.0.1/lib/rails/commands.rb:18:in `<top (required)>'
	from /Users/sonekenichiro/development/ghiiko/test_app/bin/rails:9:in `require'
	from /Users/sonekenichiro/development/ghiiko/test_app/bin/rails:9:in `<top (required)>'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/spring-1.7.2/lib/spring/client/rails.rb:28:in `load'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/spring-1.7.2/lib/spring/client/rails.rb:28:in `call'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/spring-1.7.2/lib/spring/client/command.rb:7:in `call'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/spring-1.7.2/lib/spring/client.rb:30:in `run'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/spring-1.7.2/bin/spring:49:in `<top (required)>'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/spring-1.7.2/lib/spring/binstub.rb:11:in `load'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/gems/2.4.0/gems/spring-1.7.2/lib/spring/binstub.rb:11:in `<top (required)>'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /Users/sonekenichiro/.rbenv/versions/2.4.0-dev/lib/ruby/2.4.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /Users/sonekenichiro/development/ghiiko/test_app/bin/spring:15:in `<top (required)>'
	from /Users/sonekenichiro/development/ghiiko/test_app/bin/rails:3:in `load'
	from /Users/sonekenichiro/development/ghiiko/test_app/bin/rails:3:in `<main>'

何が原因でしょうか？

追記
rake assets::precompileをしても全く同じエラーが出ます...
これはなんのコマンドでしょうか？

Comments

[moke]

rake assets::precompileをしましたか？

Answer 1

sprocket はjavascriptやstilesheetをまとめて管理し読み込みのラグを少なくするシステムの一部です。
それを明示的に行うのがrake assets::precompileなのです。（正確ではないですが一応の理解でOK）

本家のコードを見てきました
どうやらバグのようです。
sprocketsを4.0.0bata1以上にするか
rubyのversionを2.3に下げてください。

rubyは後方互換性よりもプログラマの生産性を重視する意欲的なアップデートを行います。
なので、各ライブラリのアップデードが間に合わない場合があります。
これはrubyに限らず一般的に言えることなのですが。
初心者のうちは、よっぽど使いたい機能がない限り、安定してくるまで、最新のものより一つ前のヴァージョンを利用することをお勧めします。

Comments

[ken0625]

詳しい解説ありがとうございます！
逆にsprocketsのバージョンを3.6.0まで下げたら動きました！
rackというライブラリとのバージョン互換性に問題があるみたい？
というのがわかって下げてみたら動いたのですがrubyに問題があったんですね。

バージョンには気をつけます。ありがとうございました。