ruby - Rails 3 - 'Couldn't parse Yaml' -

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i don't know did wrong. try run 'rails c,' gives me error. working 10 minutes ago. :\

c:/ruby192/lib/ruby/1.9.1/psych.rb:148:in `parse': couldn't parse yaml @ line 2  column 12 (psych::syntaxerror)         c:/ruby192/lib/ruby/1.9.1/psych.rb:148:in `parse_stream'         c:/ruby192/lib/ruby/1.9.1/psych.rb:119:in `parse'         c:/ruby192/lib/ruby/1.9.1/psych.rb:106:in `load'         c:/ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/applic ation/configuration.rb:88:in `database_configuration'         c:/ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.7/lib/active_r ecord/railtie.rb:58:in `block (2 levels) in <class:railtie>'         c:/ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.7/lib/active_ support/lazy_load_hooks.rb:36:in `instance_eval'         c:/ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.7/lib/active_ support/lazy_load_hooks.rb:36:in `execute_hook'         c:/ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.7/lib/active_ support/lazy_load_hooks.rb:43:in `block in run_load_hooks'         c:/ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.7/lib/active_ support/lazy_load_hooks.rb:42:in `each'         c:/ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.7/lib/active_ support/lazy_load_hooks.rb:42:in `run_load_hooks'         c:/ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.7/lib/active_r ecord/base.rb:1904:in `<top (required)>'         c:/ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.7/lib/active_r ecord/railtie.rb:32:in `block in <class:railtie>'         c:/ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/railti e.rb:180:in `call'         c:/ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/railti e.rb:180:in `each'         c:/ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/railti e.rb:180:in `load_console'         c:/ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/applic ation.rb:154:in `block in load_console'         c:/ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/applic ation/railties.rb:11:in `each'         c:/ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/applic ation/railties.rb:11:in `all'         c:/ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/applic ation.rb:154:in `load_console'         c:/ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/comman ds/console.rb:26:in `start'         c:/ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/comman ds/console.rb:8:in `start'         c:/ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/comman ds.rb:23:in `<top (required)>'         script/rails:6:in `require'         script/rails:6:in `<main>'

the stack dump mentions database_configuration, i'd start database.yml file. 

    c:/ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.7/lib/rails/application/configuration.rb:88:in `database_configuration'

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