scaffold didn't work

i am using rails -v 3.0.7.when i tried "rails generate scaffold try
name:string number:decimal" , it gave following error message
   invoke active_record
/usr/lib/ruby/1.8/yaml.rb:133:in `load': syntax error on line 7, col
2: ` pool: 5' (ArgumentError)
    from /usr/lib/ruby/1.8/yaml.rb:133:in `load'
    from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/
application/configuration.rb:88:in `database_configuration'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.7/lib/
active_record/railtie.rb:58
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/
active_support/lazy_load_hooks.rb:36:in `instance_eval'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/
active_support/lazy_load_hooks.rb:36:in `execute_hook'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/
active_support/lazy_load_hooks.rb:43:in `run_load_hooks'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/
active_support/lazy_load_hooks.rb:42:in `each'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/
active_support/lazy_load_hooks.rb:42:in `run_load_hooks'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.7/lib/
active_record/base.rb:1904
    from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/
generators/named_base.rb:97:in `pluralize_table_names?'
    from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/
generators/named_base.rb:44:in `table_name'
    from /usr/lib/ruby/gems/1.8/gems/activerecord-3.0.7/lib/rails/
generators/active_record/model/model_generator.rb:16:in
`create_migration_file'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/task.rb:
22:in `send'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/task.rb:
22:in `run'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/
invocation.rb:118:in `invoke_task'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/
invocation.rb:124:in `invoke_all'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/
active_support/dependencies.rb:239:in `map'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/core_ext/
ordered_hash.rb:75:in `each'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/
invocation.rb:124:in `map'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/
invocation.rb:124:in `invoke_all'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/group.rb:
226:in `dispatch'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/
invocation.rb:109:in `send'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/
invocation.rb:109:in `invoke'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/group.rb:
269:in `_invoke_for_class_method'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/shell.rb:
74:in `with_padding'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/group.rb:
258:in `_invoke_for_class_method'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/group.rb:
134:in `_invoke_from_option_orm'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/task.rb:
22:in `send'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/task.rb:
22:in `run'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/
invocation.rb:118:in `invoke_task'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/
invocation.rb:124:in `invoke_all'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/shell.rb:
14:in `map'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/core_ext/
ordered_hash.rb:75:in `each'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/
invocation.rb:124:in `map'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/
invocation.rb:124:in `invoke_all'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/group.rb:
226:in `dispatch'
    from /usr/lib/ruby/gems/1.8/gems/thor-0.14.6/lib/thor/base.rb:
389:in `start'
    from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/
generators.rb:163:in `invoke'
    from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/commands/
generate.rb:10
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/
active_support/dependencies.rb:239:in `require'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/
active_support/dependencies.rb:239:in `require'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/
active_support/dependencies.rb:225:in `load_dependency'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/
active_support/dependencies.rb:596:in `new_constants_in'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/
active_support/dependencies.rb:225:in `load_dependency'
    from /usr/lib/ruby/gems/1.8/gems/activesupport-3.0.7/lib/
active_support/dependencies.rb:239:in `require'
    from /usr/lib/ruby/gems/1.8/gems/railties-3.0.7/lib/rails/
commands.rb:17
    from script/rails:6:in `require'
    from script/rails:6

Please somebody help
Thanks

i am using rails -v 3.0.7.when i tried "rails generate scaffold try
name:string number:decimal" , it gave following error message
  invoke active_record
/usr/lib/ruby/1.8/yaml.rb:133:in `load': syntax error on line 7, col
2: ` pool: 5' (ArgumentError)

You have a syntax error in your database.yml file, probably on line 7 or thereabouts.

Fred