Ruby on rails rake在rails 3.2中实现db:drop时中止错误

我是rails新手。我曾尝试过

rakedb:drop

，但出现以下错误

rake aborted!
(<unknown>): mapping values are not allowed in this context at line 21 column 12
/home/chiron/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.11/lib/rails/application/configuration.rb:115:in `database_configuration'
/home/chiron/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.11/lib/active_record/railties/databases.rake:25:in `block (2 levels) in <top (required)>'
Tasks: TOP => db:drop => db:load_config
(See full trace by running task with --trace) 

---

谁能帮我一下吗

配置中有多余的空格键

  pool: 5
   username: chiron # << here
  password: 

pool:5
用户名：chiron#现在出现以下错误：-ls/commands.rb:55:in'block in'from/home/chiron/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.11/lib/rails
  pool: 5
   username: chiron # << here
  password: