13:28 $ rake generate
rake aborted!
You have already activated rake 10.1.1, but your Gemfile requires rake 0.9.2.2. Prepending `bundle exec` to your command may solve this.
/Users/androidyue/.rvm/gems/ruby-1.9.3-p484/gems/bundler-1.6.2/lib/bundler/runtime.rb:34:in `block in setup'
/Users/androidyue/.rvm/gems/ruby-1.9.3-p484/gems/bundler-1.6.2/lib/bundler/runtime.rb:19:in `setup'
/Users/androidyue/.rvm/gems/ruby-1.9.3-p484/gems/bundler-1.6.2/lib/bundler.rb:120:in `setup'
/Users/androidyue/.rvm/gems/ruby-1.9.3-p484/gems/bundler-1.6.2/lib/bundler/setup.rb:7:in `<top (required)>'
/Users/androidyue/github/myblog/Rakefile:2:in `<top (required)>'
(See full trace by running task with --trace)

13:48 $ gem list rake

*** LOCAL GEMS ***

rake (10.1.1, 0.9.6, 0.9.2.2)

bundle exec rake generate

 group :development do
-  gem 'rake', '~> 0.9'
+  gem 'rake', '~> 10.0'