title: Trying to use rspec, but getting an error that rspec-core 2.2.1 has been activated, but my Gemfile requires rspec-core 2.1.0
body: <p>I've update my gems.  I've created a sample Rails app and have the following in my Gemfile:</p>
  
  <pre><code>source 'http://rubygems.org'
  
  gem 'rails', '3.0.3'
  gem 'sqlite3-ruby', :require =&gt; 'sqlite3'
  
  group :development do
    gem 'rspec-rails'
  end
  
  group :test do
    gem 'rspec'
    gem 'webrat', '0.7.1'
  end
  </code></pre>
  
  <p>However, when I run 'rspec spec/', I get the following message:</p>
  
  <pre><code>/home/jeff/.rvm/gems/ruby-1.9.2-p0/gems/bundler-1.0.7/lib/bundler/runtime.rb:27:in `block in setup': 
  You have already activated rspec-core 2.2.1, but your Gemfile requires rspec-core 2.1.0. 
  Consider using bundle exec. (Gem::LoadError)
  </code></pre>