Problem generate migration

Hello, I have Ruby installed in my Windows 7, but when I try to generate
a new migration, this error appears:

C:\rails\organily>rails g migration Task
invoke active_record
C:/Ruby193/lib/ruby/1.9.1/psych.rb:203:in parse': (<unknown>): mapping values a re not allowed in this context at line 8 column 13 (Psych::SyntaxError) from C:/Ruby193/lib/ruby/1.9.1/psych.rb:203:inparse_stream’
from C:/Ruby193/lib/ruby/1.9.1/psych.rb:151:in parse' from C:/Ruby193/lib/ruby/1.9.1/psych.rb:127:inload’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.3/lib/rails/applic
ation/configuration.rb:115:in database_configuration' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/active_r ecord/railtie.rb:75:inblock (2 levels) in class:Railtie
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.3/lib/active_
support/lazy_load_hooks.rb:36:in instance_eval' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.3/lib/active_ support/lazy_load_hooks.rb:36:inexecute_hook’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.3/lib/active_
support/lazy_load_hooks.rb:43:in block in run_load_hooks' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.3/lib/active_ support/lazy_load_hooks.rb:42:ineach’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.3/lib/active_
support/lazy_load_hooks.rb:42:in run_load_hooks' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/active_r ecord/base.rb:721:in<top (required)>’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/active_r
ecord/migration.rb:507:in next_migration_number' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/active_r ecord/migration.rb:334:inmethod_missing’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/rails/ge
nerators/active_record.rb:21:in next_migration_number' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.3/lib/rails/genera tors/migration.rb:49:inmigration_template’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.3/lib/rails/ge
nerators/active_record/migration/migration_generator.rb:10:in
create_migration_ file' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/task.rb:22 :inrun’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:118:in invoke_task' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation .rb:124:inblock in invoke_all’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:124:in each' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation .rb:124:inmap’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:124:in invoke_all' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/group.rb:2 26:indispatch’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:109:in invoke' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/group.rb:2 69:inblock in invoke_for_class_method’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/shell.rb:7
4:in with_padding' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/group.rb:2 58:ininvoke_for_class_method’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/group.rb:1
50:in _invoke_from_option_orm' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/task.rb:22 :inrun’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:118:in invoke_task' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation .rb:124:inblock in invoke_all’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:124:in each' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation .rb:124:inmap’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/invocation
.rb:124:in invoke_all' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/group.rb:2 26:indispatch’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/thor-0.14.6/lib/thor/base.rb:38
9:in start' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.3/lib/rails/genera tors.rb:170:ininvoke’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.3/lib/rails/comman
ds/generate.rb:12:in <top (required)>' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.3/lib/active_ support/dependencies.rb:251:inrequire’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.3/lib/active

support/dependencies.rb:251:in block in require' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.3/lib/active_ support/dependencies.rb:236:inload_dependency’
from
C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.3/lib/active

support/dependencies.rb:251:in require' from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.3/lib/rails/comman ds.rb:29:in<top (required)>’
from script/rails:6:in require' from script/rails:6:in

I don’t know what that means, don’t know if is missing something.

Thank you all.