rails 5.2.3 Bootsnap::LoadPathCache::FallbackScanというエラーでrailsが動きません。

Question

Bootsnap::LoadPathCache::FallbackScan
というエラーが出て全てのrailsの画面が表示できなくなりました。
エラー画面には上記赤文字以外には何も表示されてません。

エラーまでの経緯
画像アップロード機能を実装するためにGemfileに以下を記述
gem 'rmagick'
ターミナルでbundle installを実行
以下のエラーメッセージがターミナルに

Fetching rmagick 4.0.0
Installing rmagick 4.0.0 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.
current directory:
/Users/mizunomasaya/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rmagick-4.0.0/ext/RMagick
/Users/mizunomasaya/.rbenv/versions/2.5.1/bin/ruby -r
./siteconf20190817-38378-1n49c0p.rb extconf.rb
checking for brew... yes
checking for clang... yes
checking for pkg-config... yes

ERROR: Can't install RMagick 4.0.0. Can't find ImageMagick with
pkg-config

*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers. Check the mkmf.log file for more details. You may
need configuration options.

Provided configuration options:
--with-opt-dir
--without-opt-dir
--with-opt-include
--without-opt-include=${opt-dir}/include
--with-opt-lib
--without-opt-lib=${opt-dir}/lib
--with-make-prog
--without-make-prog
--srcdir=.
--curdir
--ruby=/Users/mizunomasaya/.rbenv/versions/2.5.1/bin/$(RUBY_BASE_NAME)

To see why this extension failed to compile, please check the mkmf.log which can
be found here:

/Users/mizunomasaya/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/extensions/x86_64-darwin-16/2.5.0-static/rmagick-4.0.0/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in
/Users/mizunomasaya/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rmagick-4.0.0
for inspection.
Results logged to
/Users/mizunomasaya/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/extensions/x86_64-darwin-16/2.5.0-static/rmagick-4.0.0/gem_make.out

An error occurred while installing rmagick (4.0.0), and Bundler cannot
continue.
Make sure that gem install rmagick -v '4.0.0' --source 'https://rubygems.org/'
succeeds before bundling.

In Gemfile:
rmagick

bundle installに失敗
そのままrails sで以下のエラーメッセージ
Could not find gem 'rmagick' in any of the gem sources listed in your Gemfile.

Gemfileからgem 'rmagick'の記述消し、再度rails sで
サーバーは起動したものの、冒頭のエラーメッセージでどのviewも見れず。
ターミナルにもBootsnap::LoadPathCache::FallbackScan - :の文字が出てます。

この記事の内容を試してもダメでした。

https://qiita.com/Daniel_Nakano/items/aadeaa7ae4e227b73878

解消法をご教示ください。

Gemfile

source 'https://rubygems.org'
git_source(:github) { |repo| "https://github.com/#{repo}.git" }

ruby '2.5.1'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '~> 5.2.3'
# Use postgresql as the database for Active Record
gem 'pg', '>= 0.18', '< 2.0'
# Use Puma as the app server
gem 'puma', '~> 3.11'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'mini_racer', platforms: :ruby

# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.2'
# Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
gem 'turbolinks', '~> 5'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.5'
# Use Redis adapter to run Action Cable in production
# gem 'redis', '~> 4.0'
# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'
gem 'jbuilder', '~> 2.5'
gem 'devise'
gem 'rails_admin'
gem 'cancan'
gem 'pry-rails'
gem 'better_errors'
# Use ActiveStorage variant
# gem 'mini_magick', '~> 4.8'
gem 'rails_admin'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

# Reduces boot times through caching; required in config/boot.rb
gem 'bootsnap', '>= 1.0.0', require: false

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]
end

group :development do
  # Access an interactive console on exception pages or by calling 'console' anywhere in the code.
  gem 'web-console', '>= 3.3.0'
  gem 'listen', '>= 3.0.5', '< 3.2'
  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
  gem 'spring-watcher-listen', '~> 2.0.0'
end

group :test do
  # Adds support for Capybara system testing and selenium driver
  gem 'capybara', '>= 2.15'
  gem 'selenium-webdriver'
  # Easy installation and use of chromedriver to run system tests with Chrome
  gem 'chromedriver-helper'
end

# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

gem "jquery-rails"

gem 'carrierwave', '~> 1.0'

Answer 1

こんばんは。
エラーメッセージをちゃんと見れば解決の糸口がつかめると思いますよ。
rmagickは

ERROR: Can't install RMagick 4.0.0. Can't find ImageMagick with

とエラーが出ているので、ImageMagickがインストールされてないことが原因です。
先にImageMagickをインストールしてからGemfileにrmagickを追記してbundle installで入ると思います。

それでもrails sできないなら、こちらの記事のように一回キャッシュ消してみるのがよいですね。
https://qiita.com/cyborg__ninja/items/d15b50500f4ffb069feb

（※エラーメッセージもコードブロックを使ってもらえると読みやすいです）

Comments

[lucky_luci]

ありがとうございます！解決しました！

[8zca]

よかったです????