ember.js build error

± ~/dev/ember.js (master ✓) ⚡ rake -V
rake, version 10.0.3
± ~/dev/ember.js (master ✓) ⚡ rake dist
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/rake_module.rb:25: warning: redundant nested repeat operator
rake aborted!
cannot load such file -- bundler/setup
/Users/pdokas/dev/ember.js/Rakefile:3:in `<top (required)>'
(See full trace by running task with --trace)
± ~/dev/ember.js (master ✓) ⚡ rake dist --trace
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/rake_module.rb:25: warning: redundant nested repeat operator
rake aborted!
cannot load such file -- bundler/setup
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/Users/pdokas/dev/ember.js/Rakefile:3:in `<top (required)>'
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/rake_module.rb:25:in `load'
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/rake_module.rb:25:in `load_rakefile'
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:583:in `raw_load_rakefile'
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:89:in `block in load_rakefile'
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:160:in `standard_exception_handling'
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:88:in `load_rakefile'
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:72:in `block in run'
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:160:in `standard_exception_handling'
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/gems/1.9.1/gems/rake-10.0.3/lib/rake/application.rb:70:in `run'
/usr/local/Cellar/ruby/1.9.3-p362/lib/ruby/gems/1.9.1/gems/rake-10.0.3/bin/rake:33:in `<top (required)>'
/usr/local/Cellar/ruby/1.9.3-p362/bin/rake:23:in `load'
/usr/local/Cellar/ruby/1.9.3-p362/bin/rake:23:in `<main>'