ruby​​OnRails gem rinrubyのエラー

Question

rinruby 2.0.3を使用しようとしています。私のGemfileに

：私はバンドルがインストールを実行すると

gem 'rinruby', '~> 2.0.3' 

、私は問題ありません。しかし、私は実行すると：

$ rake db:create 
rake aborted! 
Bundler::GemRequireError: There was an error while trying to load the gem 'rinruby'. 
/home/jerviver21/workspace_upworkruby/blog1/config/application.rb:7:in `<top (required)>' 
/home/jerviver21/workspace_upworkruby/blog1/Rakefile:4:in `<top (required)>' 
Errno::ENOENT: No such file or directory - R 
/home/jerviver21/workspace_upworkruby/blog1/config/application.rb:7:in `<top (required)>' 
/home/jerviver21/workspace_upworkruby/blog1/Rakefile:4:in `<top (required)>' 
(See full trace by running task with --trace) 

私はUbuntuの14.04、とPostgreSQL 9.4.7

をこれは私のGemfileされ使用しています：

私はこのエラーを持っている

rake db:migrate 

source 'https://rubygems.org' 

#Buscar en rubygems.org las implementaciones que se necesiten 
#Registro y autenticacion de usuarios 
gem 'devise' 

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails' 
gem 'rails', '4.1.5' 
# Use postgresql as the database for Active Record 
gem 'pg' 
# Use SCSS for stylesheets 
gem 'sass-rails', '~> 4.0.3' 
# Use Uglifier as compressor for JavaScript assets 
gem 'uglifier', '>= 1.3.0' 
# Use CoffeeScript for .js.coffee assets and views 
gem 'coffee-rails', '~> 4.0.0' 
# See https://github.com/sstephenson/execjs#readme for more supported runtimes 
# gem 'therubyracer', platforms: :ruby 

# Use jquery as the JavaScript library 
gem 'jquery-rails' 
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks 
gem 'turbolinks' 
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder 
gem 'jbuilder', '~> 2.0' 
#rinruby 
gem 'rinruby', '~> 2.0.3' 

# bundle exec rake doc:rails generates the API under doc/api. 
gem 'sdoc', '~> 0.4.0',   group: :doc 

# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring 
gem 'spring',  group: :development 

# Use ActiveModel has_secure_password 
# gem 'bcrypt', '~> 3.1.7' 

# Use unicorn as the app server 
# gem 'unicorn' 

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

# Use debugger 
# gem 'debugger', group: [:development, :test]