run scaffold report error.

[lighthouse-import]

Imported from Lighthouse. Original ticket at: http://rails.lighthouseapp.com/projects/8994/tickets/6658
Created by lyo - 2011-03-31 15:44:38 UTC

Rails 3.0.5
ruby 1.9.2p180 (2011-02-18) [i386-mingw32]

when I run "rails generate scaffold Course name:string",cmd report ``` javascript

error:
F:\Ruby192\bin\ptest>rails generate scaffold Course name:string
invoke active_record
f:/Ruby192/lib/ruby/1.9.1/psych.rb:148:in parse': couldn't parse YAML at line 9 column 2 (Psych::SyntaxError) from f:/Ruby192/lib/ruby/1.9.1/psych.rb:148:inparse_stream'
from f:/Ruby192/lib/ruby/1.9.1/psych.rb:119:in parse' from f:/Ruby192/lib/ruby/1.9.1/psych.rb:106:inload'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/applic
ation/configuration.rb:88:in database_configuration' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.5/lib/active_r ecord/railtie.rb:58:inblock (2 levels) in class:Railtie'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.5/lib/active_
support/lazy_load_hooks.rb:36:in instance_eval' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.5/lib/active_ support/lazy_load_hooks.rb:36:inexecute_hook'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.5/lib/active_
support/lazy_load_hooks.rb:43:in block in run_load_hooks' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.5/lib/active_ support/lazy_load_hooks.rb:42:ineach'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.5/lib/active_
support/lazy_load_hooks.rb:42:in run_load_hooks' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.5/lib/active_r ecord/base.rb:1900:in<top (required)>'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/genera
tors/named_base.rb:97:in pluralize_table_names?' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/genera tors/named_base.rb:44:intable_name'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activerecord-3.0.5/lib/rails/ge
nerators/active_record/model/model_generator.rb:16:in create_migration_file' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/task.rb:22 :inrun'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:118:in invoke_task' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation .rb:124:inblock in invoke_all'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:124:in each' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation .rb:124:inmap'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:124:in invoke_all' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/group.rb:2 26:indispatch'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:109:in invoke' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/group.rb:2 69:inblock in invoke_for_class_method'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/shell.rb:7
4:in with_padding' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/group.rb:2 58:ininvoke_for_class_method'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/group.rb:1
50:in _invoke_from_option_orm' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/task.rb:22 :inrun'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:118:in invoke_task' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation .rb:124:inblock in invoke_all'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:124:in each' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation .rb:124:inmap'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:124:in invoke_all' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/group.rb:2 26:indispatch'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/base.rb:38
9:in start' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/genera tors.rb:163:ininvoke'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/comman
ds/generate.rb:10:in <top (required)>' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.5/lib/active_ support/dependencies.rb:239:in require'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.5/lib/active
support/dependencies.rb:239:inblock in require' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.5/lib/active_ support/dependencies.rb:225:in block in load_dependency'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.5/lib/active
support/dependencies.rb:596:innew_constants_in' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.5/lib/active_ support/dependencies.rb:225:in load_dependency'
from f:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-3.0.5/lib/active_
support/dependencies.rb:239:inrequire' from f:/Ruby192/lib/ruby/gems/1.9.1/gems/railties-3.0.5/lib/rails/comman ds.rb:17:in <top (required)>'
from script/rails:6:inrequire' from script/rails:6:in

'

Why it happened ? help! Thanks!