Could not find rake-12.0.0 in any of the sources error when rails-v occurs

:/var/www/myapp/development/current$rails-v
Could not findrake-12.0.0 in any of the sources
Run `bundle install` to install missing gems.

gem 'rails', '5.0.3'
gem 'will_paginate', '3.1.0'
gem 'bootstrap-will_paginate', '0.0.10'
gem'bootstrap-ass', '~>3.3.6' 
gem'sass-rails', '>=3.2'
gem 'puma', '3.4.0'
gem 'uglifer', '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'
gem 'devise'
gem 'toastr-rails'
gem 'omniauth'
gem 'omniauth-facebook'
gem 'omniauth-twitter'
gem 'omniauth-google-oauth2'
gem 'paperclip'
gem 'geocoder'
gem 'jquery-ui-rails', '5.0.5'
gem 'private_pub'
gem'thin'
gem 'ransack'
gem 'font-awesome-rails'
gem 'font-awesome-sass'
gem 'rails-i18n'
gem'payjp'
gem'carrierwave'
gem'rmagic'
gem 'rack-mini-profiler'
gem'rb-readline'
gem 'unicorn'
gem 'capistrano', '~>3.6'
gem 'capistrano-rails', '~>1.3'
gem 'capistrano-bundler'
gem 'capistrano-passenger'
gem 'capistrano-rbenv'
gem'therubyracer', platforms::ruby
gem'capistrano3-unicorn'
gem'capistrano-safe-deploy-to'
gem 'listen', '~>3.1.5'
gem'sqlite 3', '1.3.13'

group —Development do
  gem 'web-console', '3.1.1'
  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'
  gem 'rails_12 factor'

ubuntu 16.04
Bundler 1.14.6
ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16]
Rails 5.0.3
capistrano3
cloud9 (local environment)
nginx 1.10.3-0 ubuntu 0.16.04.2
unicorn 4.9.0-2build2