Rest-Client将不会为Ruby安装

Question

I am trying to run a Ruby app with the rest-client gem install. I keep getting the error message:

C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows/root_certs.rb:2:in `require': cannot load such file -- ffi (LoadError)
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows/root_certs.rb:2:in `<top (required)>'
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows.rb:7:in `require_relative'
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows.rb:7:in `<top (required)>'
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient.rb:16:in `require'
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient.rb:16:in `<top (required)>'
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/rest-client.rb:2:in `require'
    from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/rest-client.rb:2:in `<top (required)>'
    from app.rb:6:in `require'
    from app.rb:6:in `<main>'

$ ./start ruby
Installing bundle
Starting server
C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows/root_certs.rb:2:in `require': cannot load such file -- ffi (LoadError)
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows/root_certs.rb:2:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows.rb:7:in `require_relative'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient/windows.rb:7:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient.rb:16:in `require'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/restclient.rb:16:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/rest-client.rb:2:in `require'
        from C:/RailsInstaller/Ruby2.1.0/lib/ruby/gems/2.1.0/gems/rest-client-1.8.0/lib/rest-client.rb:2:in `<top (required)>'
        from app.rb:6:in `require'
        from app.rb:6:in `<main>'

However I am sure that the gem is install:

rest-client (2.0.0.rc2, 1.8.0)
rest-open-uri (1.0.0)
rest_client (1.8.3)

Does anyone know possibly what I am doing wrong in the installation process?

Answer 1

The issue was the that FFI was not install and was the reason I was getting error messages. unfortunately using

bundle install

did not install it correct and I had to install the gem manually (which takes much longer than expected to install

 gem install ffi