Error when starting WEBrick with script/server command

Hi! I am new with Ruby on Rails and very interested with the language. I am trying to follow an example from a book but when I run the "script/server" command I have got the following error message: => Booting WEBrick => Rails 2.3.4 application starting on http://0.0.0.0:3000 C:/Ruby192/lib/ruby/1.9.1/syck.rb:135:in `load': syntax error on line 20, col -1: `' (ArgumentError)   from C:/Ruby192/lib/ruby/1.9.1/syck.rb:135:in `load'   from C:/Ruby192/lib/ruby/gems/1.9.1/gems/rails-2.3.4/lib/initializer.rb:902:in `database_configuration'   from C:/Ruby192/lib/ruby/gems/1.9.1/gems/rails-2.3.4/lib/initializer.rb:437:in `initialize_database'   from C:/Ruby192/lib/ruby/gems/1.9.1/gems/rails-2.3.4/lib/initializer.rb:141:in `process'   from C:/Ruby192/lib/ruby/gems/1.9.1/gems/rails-2.3.4/lib/initializer.rb:113:in `run'   from C:/Users/patriciac/My Documents/Aptana RadRails Workspace/emporium/config/environment.rb:9:in `<top (required)>'   from <internal:lib/rubygems/custom_require>:29:in `require'   from <internal:lib/rubygems/custom_require>:29:in `require'   from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `block in require'   from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:521:in `new_constants_in'   from C:/Ruby192/lib/ruby/gems/1.9.1/gems/activesupport-2.3.4/lib/active_support/dependencies.rb:156:in `require'   from C:/Ruby192/lib/ruby/gems/1.9.1/gems/rails-2.3.4/lib/commands/server.rb:84:in `<top (required)>'   from <internal:lib/rubygems/custom_require>:29:in `require'   from <internal:lib/rubygems/custom_require>:29:in `require'   from script/server:3:in `<main>'

Could someone tell me what is wrong here? I have followed all the steps the book mentions but it seems like there is something wrong with the example code because it doesn't work. I will appreciate a lot the help from yours. I am using Aptana Radrails Studio to code the application. Thanks! Regards, Patricia