serve doesn't seem to work... about graphene HOT 8 OPEN

$ bundle exec serve .

/opt/graphene/example # bundle exec serve .
Could not find coderay-1.0.9 in any of the sources
Run `bundle install` to install missing gems.

/opt/graphene/example # bundle install
Don't run Bundler as root. Bundler can ask for sudo if it is needed, and installing your bundle as root will break this application for all non-root
users on this machine.
Fetching gem metadata from https://rubygems.org/..........
Fetching https://github.com/jondot/guard-sprockets.git
Installing coderay 1.0.9
Installing coffee-script-source 1.2.0
Installing multi_json 1.0.4
Installing execjs 1.3.0
Installing coffee-script 2.2.0
Installing ffi 1.9.0
Installing formatador 0.2.4
Installing rb-fsevent 0.9.3
Installing rb-inotify 0.9.2
Installing rb-kqueue 0.2.0
Installing listen 1.2.2
Installing lumberjack 1.0.4
Installing method_source 0.8.2
Installing slop 3.4.6
Installing pry 0.9.12.2
Installing thor 0.18.1
Installing guard 1.8.2
Installing hike 1.2.3
Using rack 1.5.2
Installing tilt 1.4.1
Installing sprockets 2.10.0
Using guard-sprockets 0.2.0 from https://github.com/jondot/guard-sprockets.git (at master)
Installing sass 3.1.15
Installing uglifier 1.2.3
Using bundler 1.7.3
Your bundle is complete!
Use `bundle show [gemname]` to see where a bundled gem is installed.

/opt/graphene/example # bundle exec serve .
/usr/local/rvm/gems/ruby-2.0.0-p0@global/gems/bundler-1.7.3/lib/bundler/rubygems_integration.rb:256:in `block in replace_gem': serve is not part of the bundle. Add it to Gemfile. (Gem::LoadError)
    from /usr/local/rvm/gems/ruby-2.0.0-p0/bin/serve:22:in `<main>'
    from /usr/local/rvm/gems/ruby-2.0.0-p0/bin/ruby_executable_hooks:15:in `eval'
    from /usr/local/rvm/gems/ruby-2.0.0-p0/bin/ruby_executable_hooks:15:in `<main>'

/opt/graphene # gem install serve
Successfully installed serve-1.5.2
Parsing documentation for serve-1.5.2
unable to convert "\x89" from ASCII-8BIT to UTF-8 for lib/serve/templates/default/public/images/serve-logo.png, skipping
1 gem installed

/opt/graphene # rvm list rubies

rvm rubies

=* ruby-2.0.0-p0 [ x86_64 ]
   ruby-2.0.0-p481 [ x86_64 ]
   ruby-2.1.0 [ x86_64 ]
   ruby-2.1.2 [ x86_64 ]

/opt/graphene # rvm gemset list_all

gemsets for ruby-2.1.2 (found in /usr/local/rvm/gems/ruby-2.1.2)
=> (default)
   global


gemsets for ruby-2.1.0 (found in /usr/local/rvm/gems/ruby-2.1.0)
=> (default)
   global


gemsets for ruby-2.0.0-p481 (found in /usr/local/rvm/gems/ruby-2.0.0-p481)
=> (default)
   global


gemsets for ruby-2.0.0-p0 (found in /usr/local/rvm/gems/ruby-2.0.0-p0)
=> (default)
   global

/opt/graphene/example # gem uninstall i18n

You have requested to uninstall the gem:
    i18n-0.7.0.beta1

activesupport-3.2.19 depends on i18n (>= 0.6.4, ~> 0.6)
serve-1.5.2 depends on i18n (>= 0)
If you remove this gem, these dependencies will not be met.
Continue with Uninstall? [yN]  y
Successfully uninstalled i18n-0.7.0.beta1

opt/graphene/example # gem install i18n -v 0.6.11
Fetching: i18n-0.6.11.gem (100%)
Successfully installed i18n-0.6.11
Parsing documentation for i18n-0.6.11
Installing ri documentation for i18n-0.6.11
1 gem installed

npm install -g serve
serve -s example