cucumber load error activesupport

I am new to rails and I having trouble using cucumber to run my tests. I get the following error:

You have already activated activesupport 3.1.0, but your Gemfile requires activesupport 3.1.0.rc8. Consider using bundle exec. (Gem::LoadError)

and my gemfile looks like the following:

source 'http://rubygems.org'

gem 'rails', '3.1.0.rc8'

group :assets do
  gem 'sass-rails', "  ~> 3.1.0.rc"
  gem 'coffee-rails', "~>开发者_如何学Python; 3.1.0.rc"
  gem 'uglifier'
end
gem 'jquery-rails'
gem "therubyracer", ">= 0.8.2"
gem "haml", ">= 3.1.2"
gem "haml-rails", ">= 0.3.4", :group => :development
gem "rspec-rails", ">= 2.6.1", :group => [:development, :test]
gem "guard-rspec"
gem "database_cleaner", ">= 0.6.7", :group => :test
gem "mongoid-rspec", ">= 1.4.4", :group => :test
gem "factory_girl_rails", ">= 1.1.0", :group => :test
gem "cucumber-rails", ">= 1.0.2", :group => :test
gem "capybara", ">= 1.0.1", :group => :test
gem "launchy", ">= 2.0.5", :group => :test
gem "bson_ext", ">= 1.3.1"
gem "mongoid", ">= 2.1.9"
gem 'devise', :git => 'git://github.com/plataformatec/devise.git', :branch => 'master'
gem "frontend-helpers"
gem "rails-footnotes", ">= 3.7", :group => :development
gem "barista"
gem "sunspot"
gem 'sunspot_rails'
gem "sunspot_mongoid"
gem 'vinova_sunspot_mongoid', :require => 'sunspot_mongoid'
gem "fakeweb", "~> 1.3.0"
gem "sunspot_matchers", "~> 1.2.1.4"

Cucumber used to work before. I recently added sunspot and upgraded to rails 3.1.0.rc8. I don't understand bundle exec message.

thanks

---

Try:

bundler exec cucumber features

It should work fine. Please see docs for more information.

---

This what worked for me:

bundle exec cucumber features

bundle exec cucumber features/filter_movie_list.feature

The first one for all features, and the second one for certain feature.