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