无法通过Capistrano部署应用程序，LoadError：无法加载此类文件— nokogiri

Question

I'm using this tutorial to deploy my app to VPS . I have created Ubuntu Server on DigitalOcean. I have proceeded all theese steps. However on 11th step I must to write this code:

bundle exec cap production deploy

It throws me an error:

rake aborted!
DEBUG [280721fe]        LoadError: cannot load such file -- nokogiri
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/loofah-2.0.2/lib/loofah.rb:3:in `require'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/loofah-2.0.2/lib/loofah.rb:3:in `<top (required)>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/rails-html-sanitizer-1.0.2/lib/rails-html-sanitizer.rb:2:in `require'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/rails-html-sanitizer-1.0.2/lib/rails-html-sanitizer.rb:2:in `<top (required)>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/sanitize_helper.rb:3:in `require'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/sanitize_helper.rb:3:in `<top (required)>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/text_helper.rb:32:in `<module:TextHelper>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/text_helper.rb:29:in `<module:Helpers>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/text_helper.rb:6:in `<module:ActionView>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/text_helper.rb:4:in `<top (required)>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/form_tag_helper.rb:18:in `<module:FormTagHelper>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/form_tag_helper.rb:14:in `<module:Helpers>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/form_tag_helper.rb:8:in `<module:ActionView>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/form_tag_helper.rb:6:in `<top (required)>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/form_helper.rb:4:in `require'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers/form_helper.rb:4:in `<top (required)>' 
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers.rb:50:in `<module:Helpers>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers.rb:4:in `<module:ActionView>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/actionview-4.2.0/lib/action_view/helpers.rb:3:in `<top (required)>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/sprockets-rails-2.3.1/lib/sprockets/rails/legacy_asset_tag_helper.rb:7:in `<module:LegacyAssetTagHelper>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/sprockets-rails-2.3.1/lib/sprockets/rails/legacy_asset_tag_helper.rb:6:in `<module:Rails>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/sprockets-rails-2.3.1/lib/sprockets/rails/legacy_asset_tag_helper.rb:4:in `<module:Sprockets>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/sprockets-rails-2.3.1/lib/sprockets/rails/legacy_asset_tag_helper.rb:3:in `<top (required)>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/sprockets-rails-2.3.1/lib/sprockets/rails/helper.rb:54:in `require'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/sprockets-rails-2.3.1/lib/sprockets/rails/helper.rb:54:in `<module:Helper>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/sprockets-rails-2.3.1/lib/sprockets/rails/helper.rb:7:in `<module:Rails>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/sprockets-rails-2.3.1/lib/sprockets/rails/helper.rb:6:in `<module:Sprockets>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/sprockets-rails-2.3.1/lib/sprockets/rails/helper.rb:5:in `<top (required)>'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/sprockets-rails-2.3.1/lib/sprockets/railtie.rb:6:in `require'
DEBUG [280721fe]        /var/www/newsapp/shared/bundle/ruby/2.2.0/gems/sprockets-rails-2.3.1/lib/sprockets/railtie.rb:6:in `<top (required)>'
DEBUG [280721fe]        /var/www/newsapp/releases/20150710090114/config/application.rb:10:in `require'
DEBUG [280721fe]        /var/www/newsapp/releases/20150710090114/config/application.rb:10:in `<top (required)>'
DEBUG [280721fe]        /var/www/newsapp/releases/20150710090114/Rakefile:4:in `require'
DEBUG [280721fe]        /var/www/newsapp/releases/20150710090114/Rakefile:4:in `<top (required)>'
DEBUG [280721fe]        (See full trace by running task with --trace)

Ubuntu failed to load nokogiri . I happens when It tries to run rake assets:precompile command.

I have written this project on Windows 7 and uploaded it to my BitBucket repository. I thought that Capistrano runs bundle install by itself and changes Gemfile.lock .

My local computer running on Windows 7 x64 uses Ruby 2.1.5.

My VPS running on Ubuntu Server 14.04 x64 uses Ruby 2.2.0.

What do I need to do?

==== Update ====

I thought that, because I have written this app on Windows and trying to upload it to Ubuntu, my Gemfile.lock will be different. I have deleted it and tried to upload it to my VPS and it says that It can not run my app because I have not Gemfile.lock .

==== Update ====

I have restarted my VPS. I heard that Nokogiri has conflicts with 2.2 Verisons of Ruby so I have installed 2.1.6 version. Still it gives me this error on precompile.

==== Update ====

I have found that inmy Ubuntu every rake task that I want to start throws me this error.

Answer 1

我读到Nokogiri在最新版本的Ruby（2.2）上存在一些问题，也许您应该考虑在服务器上回滚到Ruby 2.1。

Answer 2

I have found solution and I think it is not good.

In my Gemfile.lock I have deleted all -64x-mingw strings, leaving only name and verison number of my gems.

In platform I simply wrote ruby instead of mingw .

Well... that worked.

Heroku deletes Windows Gemfile.lock and generates new one automatically. Is it possible to send to capistrano that kind of commands?