There was an error while trying to load the gem 'zxing'. Rails 4.2

I am trying to add gem 'zxing' into my project, but got this message after running the server

C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:80:in `rescue in block (2 levels) in require': There was an error while trying to load the gem 'zxing'. (Bundler::GemRequireError)
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `each'
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:72:in `block in require'
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `each'
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler/runtime.rb:61:in `require'
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/bundler-1.11.2/lib/bundler.rb:99:in `require'
        from C:/Sites/seas/config/application.rb:8:in `<top (required)>'
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:78:in `require'
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:78:in `block in server'
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:75:in `tap'
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:75:in `server'
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.5.1/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
        from C:/RailsInstaller/Ruby2.2.0/lib/ruby/gems/2.2.0/gems/railties-4.2.5.1/lib/rails/commands.rb:17:in `<top (required)>'
        from bin/rails:4:in `require'
        from bin/rails:4:in `<main>'

any suggestion?