Error message, occurs when starting server on feature branch

error message

>> Using rack adapter
/Users/ivanasetiawan/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych.rb:205:in `initialize': No such file or directory - /Users/ivanasetiawan/projects/codebrawl/config/codebrawl.yml (Errno::ENOENT)
	from /Users/ivanasetiawan/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych.rb:205:in `open'
	from /Users/ivanasetiawan/.rvm/rubies/ruby-1.9.2-p180/lib/ruby/1.9.1/psych.rb:205:in `load_file'
	from /Users/ivanasetiawan/projects/codebrawl/config/initializers/codebrawl.rb:3:in `config'
	from /Users/ivanasetiawan/projects/codebrawl/config/initializers/hoptoad.rb:2:in `block in <top (required)>'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/hoptoad_notifier-2.4.11/lib/hoptoad_notifier.rb:80:in `configure'
	from /Users/ivanasetiawan/projects/codebrawl/config/initializers/hoptoad.rb:1:in `<top (required)>'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.1.0.rc5/lib/active_support/dependencies.rb:233:in `load'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.1.0.rc5/lib/active_support/dependencies.rb:233:in `block in load'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.1.0.rc5/lib/active_support/dependencies.rb:223:in `block in load_dependency'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.1.0.rc5/lib/active_support/dependencies.rb:639:in `new_constants_in'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.1.0.rc5/lib/active_support/dependencies.rb:223:in `load_dependency'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/activesupport-3.1.0.rc5/lib/active_support/dependencies.rb:233:in `load'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc5/lib/rails/engine.rb:555:in `block (2 levels) in <class:Engine>'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc5/lib/rails/engine.rb:554:in `each'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc5/lib/rails/engine.rb:554:in `block in <class:Engine>'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc5/lib/rails/initializable.rb:25:in `instance_exec'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc5/lib/rails/initializable.rb:25:in `run'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc5/lib/rails/initializable.rb:50:in `block in run_initializers'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc5/lib/rails/initializable.rb:49:in `each'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc5/lib/rails/initializable.rb:49:in `run_initializers'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc5/lib/rails/application.rb:92:in `initialize!'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/railties-3.1.0.rc5/lib/rails/railtie/configurable.rb:30:in `method_missing'
	from /Users/ivanasetiawan/projects/codebrawl/config/environment.rb:5:in `<top (required)>'
	from /Users/ivanasetiawan/projects/codebrawl/config.ru:3:in `require'
	from /Users/ivanasetiawan/projects/codebrawl/config.ru:3:in `block in <main>'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/rack-1.3.2/lib/rack/builder.rb:51:in `instance_eval'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/rack-1.3.2/lib/rack/builder.rb:51:in `initialize'
	from /Users/ivanasetiawan/projects/codebrawl/config.ru:1:in `new'
	from /Users/ivanasetiawan/projects/codebrawl/config.ru:1:in `<main>'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/thin-1.2.11/lib/rack/adapter/loader.rb:36:in `eval'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/thin-1.2.11/lib/rack/adapter/loader.rb:36:in `load'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/thin-1.2.11/lib/rack/adapter/loader.rb:45:in `for'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/thin-1.2.11/lib/thin/controllers/controller.rb:169:in `load_adapter'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/thin-1.2.11/lib/thin/controllers/controller.rb:73:in `start'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/thin-1.2.11/lib/thin/runner.rb:185:in `run_command'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/thin-1.2.11/lib/thin/runner.rb:151:in `run!'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/gems/thin-1.2.11/bin/thin:6:in `<top (required)>'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/bin/thin:19:in `load'
	from /Users/ivanasetiawan/.rvm/gems/ruby-1.9.2-p180/bin/thin:19:in `<main>'
ivana-setiawans-macbook:codebrawl ivanasetiawan$ git branch