Odd error with rspec, rails 3.10rc4 and should-matchers

Gemfile

group :test, :development do
    
    gem 'ruby-debug19', :require => 'ruby-debug'
    gem 'passenger'
    gem 'rspec-rails', '>= 2.6.1'
    gem 'factory_girl_rails', '>= 1.1.beta1'
    gem 'cucumber-rails', '>= 0.5.2'
    gem 'capybara', '>= 1.0.0'
    gem 'database_cleaner', '>= 0.6.7'
    gem "rcov"
    gem "autotest"
    gem "metric_fu"
    gem "spork"
    gem "rb-fsevent"
    gem 'guard'
    gem 'guard-cucumber'
    gem 'guard-rspec'
    gem 'guard-passenger'
    gem 'shoulda-matchers', :require => 'shoulda-matchers'

end

output

F....

Failures:

  1) Product creating a new product 
     Failure/Error: it { should validate_uniqueness_of(:name) }
       Can't find first Product
     # ./spec/models/product_spec.rb:11:in `block (3 levels) in <top (required)>'

Finished in 0.43985 seconds
5 examples, 1 failure

product_spec.rb

require 'spec_helper'

describe Product do
    
  context "creating a new product" do 
  
    it { should validate_uniqueness_of(:name) }
    it { should validate_presence_of(:name) }
    it { should validate_presence_of(:description) }
    it { should validate_presence_of(:price_in_dollars) }
    it { should validate_numericality_of(:price_in_dollars) }
  end 


end

Actually, it appears that this is the desired function of validate_uniqueness_of(:name)... the tests written for this proves it:

context "without an existing value" do
      setup do
        assert_nil Example.find(:first)
        @matcher = validate_uniqueness_of(:attr)
      end

      should "fail to require a unique value" do
        assert_rejects @matcher, @model
      end

      should "alert the tester that an existing value is not present" do
        @matcher.matches?(@model)
        assert @matcher.negative_failure_message =~ /^Can't find first .*/
      end
    end