rails g model modelname gives the error. there is no mongoid.yml file i have created. i was able to create models using this command. One reason i could see that i created config/mongoid.yml file and then deleted as though will configure it later.

gistfile1.txt

Vamsi-iMac:tfl bijendra$ rails g model StandardService

**Notice: C extension not loaded. This is required for optimum MongoDB Ruby driver performance.
  You can install the extension as follows:
  gem install bson_ext

  If you continue to receive this message after installing, make sure that the
  bson_ext gem is in your load path and that the bson_ext and mongo gems are of the same version.

/Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/mongoid-2.4.11/lib/mongoid/railtie.rb:83:in `block in <class:Railtie>': undefined method `[]' for false:FalseClass (NoMethodError)
	from /Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.6/lib/rails/initializable.rb:30:in `instance_exec'
	from /Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.6/lib/rails/initializable.rb:30:in `run'
	from /Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.6/lib/rails/initializable.rb:55:in `block in run_initializers'
	from /Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.6/lib/rails/initializable.rb:54:in `each'
	from /Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.6/lib/rails/initializable.rb:54:in `run_initializers'
	from /Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.6/lib/rails/application.rb:136:in `initialize!'
	from /Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.6/lib/rails/railtie/configurable.rb:30:in `method_missing'
	from /Users/bijendra/tfl_project/tfl/config/environment.rb:5:in `<top (required)>'
	from /Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:251:in `require'
	from /Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:251:in `block in require'
	from /Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:236:in `load_dependency'
	from /Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/activesupport-3.2.6/lib/active_support/dependencies.rb:251:in `require'
	from /Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.6/lib/rails/application.rb:103:in `require_environment!'
	from /Users/bijendra/.rvm/gems/ruby-1.9.2-p320/gems/railties-3.2.6/lib/rails/commands.rb:25:in `<top (required)>'
	from script/rails:6:in `require'
	from script/rails:6:in `<main>'