当我使用 rvm 1.21.3 在 rails 4.0.0 中创建新应用程序时，出现以下错误
$rails_projects MacBook$ rails new rails4app
create
create README.rdoc
create Rakefile
create config.ru
create .gitignore
create Gemfile
create app
create app/assets/javascripts/application.js
create app/assets/stylesheets/application.css
create app/controllers/application_controller.rb
create app/helpers/application_helper.rb
create app/views/layouts/application.html.erb
create app/assets/images/.keep
create app/mailers/.keep
create app/models/.keep
create app/controllers/concerns/.keep
create app/models/concerns/.keep
create bin
create bin/bundle
create bin/rails
create bin/rake
create config
create config/routes.rb
create config/application.rb
create config/environment.rb
create config/environments
create config/environments/development.rb
create config/environments/production.rb
create config/environments/test.rb
create config/initializers
create config/initializers/backtrace_silencers.rb
create config/initializers/filter_parameter_logging.rb
create config/initializers/inflections.rb
create config/initializers/mime_types.rb
create config/initializers/secret_token.rb
create config/initializers/session_store.rb
create config/initializers/wrap_parameters.rb
create config/locales
create config/locales/en.yml
create config/boot.rb
create config/database.yml
create db
create db/seeds.rb
create lib
create lib/tasks
create lib/tasks/.keep
create lib/assets
create lib/assets/.keep
create log
create log/.keep
create public
create public/404.html
create public/422.html
create public/500.html
create public/favicon.ico
create public/robots.txt
create test/fixtures
create test/fixtures/.keep
create test/controllers
create test/controllers/.keep
create test/mailers
create test/mailers/.keep
create test/models
create test/models/.keep
create test/helpers
create test/helpers/.keep
create test/integration
create test/integration/.keep
create test/test_helper.rb
create tmp/cache
create tmp/cache/assets
create vendor/assets/javascripts
create vendor/assets/javascripts/.keep
create vendor/assets/stylesheets
create vendor/assets/stylesheets/.keep
run bundle install
Fetching gem metadata from https://rubygems.org/..........
Fetching gem metadata from https://rubygems.org/..
Resolving dependencies...
Using rake (10.1.0)
Using i18n (0.6.4)
Installing minitest (4.7.5)
Using multi_json (1.7.7)
Using atomic (1.1.10)
Using thread_safe (0.1.0)
Using tzinfo (0.3.37)
Using activesupport (4.0.0)
Using builder (3.1.4)
Using erubis (2.7.0)
Using rack (1.5.2)
Using rack-test (0.6.2)
Using actionpack (4.0.0)
Using mime-types (1.23)
Using polyglot (0.3.3)
Using treetop (1.4.14)
Using mail (2.5.4)
Using actionmailer (4.0.0)
Using activemodel (4.0.0)
Using activerecord-deprecated_finders (1.0.3)
Using arel (4.0.0)
Using activerecord (4.0.0)
Using bundler (1.3.5)
Installing coffee-script-source (1.6.2)
Installing execjs (1.4.0)
Installing coffee-script (2.2.0)
Using thor (0.18.1)
Using railties (4.0.0)
Installing coffee-rails (4.0.0)
Using hike (1.2.3)
Installing jbuilder (1.4.2)
Installing jquery-rails (3.0.1)
Installing json (1.8.0)
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
Users/MacBook/.rvm/rubies/ruby-2.0.0-p247/bin/ruby extconf.rb
creating Makefile
make
compiling generator.c
linking shared-object json/ext/generator.bundle
make install
/usr/bin/install -c -m 0755 generator.bundle /Users/MacBook/.rvm/gems/ruby-2.0.0-p247/gems/json-1.8.0/lib/Users/MacBook/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/x86_64-darwin11.4.2/json/ext
install: /Users/MacBook/.rvm/gems/ruby-2.0.0-p247/gems/json-1.8.0/lib/Users/MacBook/.rvm/rubies/ruby-2.0.0-p247/lib/ruby/site_ruby/2.0.0/x86_64-darwin11.4.2/json/ext: No such file or directory
make: *** [install-so] Error 71
Gem files will remain installed in /Users/MacBook/.rvm/gems/ruby-2.0.0-p247/gems/json-1.8.0 for inspection.
Results logged to /Users/MacBook/.rvm/gems/ruby-2.0.0-p247/gems/json-1.8.0/ext/json/ext/generator/gem_make.out
An error occurred while installing json (1.8.0), and Bundler cannot continue.
Make sure that `gem install json -v '1.8.0'` succeeds before bundling.