我安装完 mongo3 之后 run mongo3 结果得到下面的错误 信息

>>> Waiting for Franky to warm up...


F, [2013-05-08T20:35:18.376873 #8487] FATAL -- : undefined method `helpers' for CollectionHelper:Module (NoMethodError)
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/mongo3-0.1.5/lib/helpers/collection_helper.rb:15:in `<module:CollectionHelper>'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/mongo3-0.1.5/lib/helpers/collection_helper.rb:14:in `<top (required)>'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/mongo3-0.1.5/lib/mongo3.rb:49:in `load'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/mongo3-0.1.5/lib/mongo3.rb:49:in `block in load_all_libs_relative_to'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/mongo3-0.1.5/lib/mongo3.rb:49:in `each'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/mongo3-0.1.5/lib/mongo3.rb:49:in `load_all_libs_relative_to'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/mongo3-0.1.5/lib/app.rb:21:in `block in <top (required)>'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/sinatra-1.4.2/lib/sinatra/base.rb:1546:in `configure'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/sinatra-1.4.2/lib/sinatra/base.rb:1915:in `block (2 levels) in delegate'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/mongo3-0.1.5/lib/app.rb:20:in `<top (required)>'
/Users/shuxuan/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/Users/shuxuan/.rvm/rubies/ruby-1.9.3-p392/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/mongo3-0.1.5/bin/mongo3:44:in `run'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/main-5.2.0/lib/main/program/class_methods.rb:155:in `block in run'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/main-5.2.0/lib/main/program/class_methods.rb:144:in `catch'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/main-5.2.0/lib/main/program/class_methods.rb:144:in `run'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/main-5.2.0/lib/main/factories.rb:18:in `run'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/main-5.2.0/lib/main/factories.rb:25:in `Main'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/gems/mongo3-0.1.5/bin/mongo3:7:in `<top (required)>'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/bin/mongo3:19:in `load'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/bin/mongo3:19:in `<main>'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/bin/ruby_noexec_wrapper:14:in `eval'
/Users/shuxuan/.rvm/gems/ruby-1.9.3-p392@rails3tutorial2ndEd/bin/ruby_noexec_wrapper:14:in `<main>'

有人知道啥情况不？