我是 Rails 的新手，捆绑安装适用于该项目。但是当我启动 rails 服务器时会显示错误。显示的错误附在此处。
Exiting
C:/Ruby193/lib/ruby/1.9.1/psych.rb:203:in `parse': (<unknown>): could not find e
xpected ':' while scanning a simple key at line 27 column 3 (Psych::SyntaxError)
from C:/Ruby193/lib/ruby/1.9.1/psych.rb:203:in `parse_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:in `load'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/application/configuration.rb:115:in `database_configuration'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.2/lib/active_record/railtie.rb:75:in `block (2 levels) in <class:Railtie>'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_support/lazy_load_hooks.rb:26:in `on_load'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activerecord-3.2.2/lib/active_record/railtie.rb:74:in `block in <class:Railtie>'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/initializable.rb:30:in `instance_exec'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/initializable.rb:30:in `run'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/initializable.rb:55:in `block in run_initializers'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/initializable.rb:54:in `each'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/initializable.rb:54:in `run_initializers'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/application.rb:136:in `initialize!'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/railtie/configurable.rb:30:in `method_missing'
from D:/ROR/appmallserver/config/environment.rb:22:in `<top (required)>'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_support/dependencies.rb:251:in `require'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_support/dependencies.rb:251:in `block in require'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_support/dependencies.rb:236:in `load_dependency'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/activesupport-3.2.2/lib/active_support/dependencies.rb:251:in `require'
from D:/ROR/appmallserver/config.ru:4:in `block in <main>'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:51:in `instance_eval'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:51:in `initialize'
from D:/ROR/appmallserver/config.ru:1:in `new'
from D:/ROR/appmallserver/config.ru:1:in `<main>'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:40:in `eval'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/builder.rb:40:in `parse_file'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:200:in `app'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/commands/server.rb:46:in `app'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:301:in `wrapped_app'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:252:in `start'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/commands/server.rb:70:in `start'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/commands.rb:55:in `block in <top (required)>'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/commands.rb:50:in `tap'
from C:/Ruby193/lib/ruby/gems/1.9.1/gems/railties-3.2.2/lib/rails/commands.rb:50:in `<top (required)>'
from script/rails:21:in `require'
from script/rails:21:in `<main>'