用script/generate产生问题

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用script/generate产生以下问题：
C:/ruby/lib/ruby/1.8/yaml.rb:133:in `load': syntax error on line 18, col 2: `  host: localhost' (ArgumentError)
from C:/ruby/lib/ruby/1.8/yaml.rb:133:in `load'
from C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb:523:in `database_configuration'
from C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb:228:in `initialize_database'
from C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb:88:in `process'
from C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb:43:in `send'
from C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/initializer.rb:43:in `run'
from ./script/../config/../config/environment.rb:13
from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
from C:/ruby/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/commands/generate.rb:1
from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
from C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require'
from script/generate:3
请问是什么问题？如何解决？