VCR issue attached files

example.rb

require 'vcr'
require 'mechanize'

VCR.config do |c|
  c.cassette_library_dir = 'cassettes'
  c.stub_with :webmock
  c.default_cassette_options = { :record => :new_episodes  }
end


class Example
	def make_request_and_print_results
		page = Mechanize.new.get('http://example.com')
	end
end

VCR.use_cassette('example') do 
	t = Example.new
	t.make_request_and_print_results
end

example_spec.rb

require './spec_helper'
require './example'

describe Example do
	context "context" do
		use_vcr_cassette "example", :update_content_length_header => true
		it "should be okay" do 

			t = Example.new
			t.make_request_and_print_results.should_not be_nil
		end
	end

end

spec_helper.rb

require 'vcr'

RSpec.configure do |config|
  config.mock_with :rr
  config.extend VCR::RSpec::Macros
end

trace

  1) Example context should be okay
     Failure/Error: Unable to find matching line from backtrace
     NoMethodError:
       undefined method `length' for nil:NilClass
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/vcr-1.10.0/lib/vcr/structs/response.rb:16:in `update_content_length_header'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/vcr-1.10.0/lib/vcr/cassette.rb:133:in `block in load_recorded_interactions'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/vcr-1.10.0/lib/vcr/cassette.rb:133:in `each'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/vcr-1.10.0/lib/vcr/cassette.rb:133:in `load_recorded_interactions'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/vcr-1.10.0/lib/vcr/cassette.rb:42:in `initialize'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/vcr-1.10.0/lib/vcr.rb:56:in `new'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/vcr-1.10.0/lib/vcr.rb:56:in `insert_cassette'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/vcr-1.10.0/lib/vcr/test_frameworks/rspec.rb:9:in `block in use_vcr_cassette'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/hooks.rb:35:in `instance_eval'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/hooks.rb:35:in `run_in'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/hooks.rb:70:in `block in run_all'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/hooks.rb:70:in `each'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/hooks.rb:70:in `run_all'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/hooks.rb:116:in `run_hook'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:221:in `block in eval_before_eachs'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:221:in `each'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:221:in `eval_before_eachs'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example.rb:145:in `run_before_each'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example.rb:47:in `block in run'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example.rb:107:in `with_around_hooks'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example.rb:45:in `run'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:294:in `block in run_examples'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:290:in `map'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:290:in `run_examples'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:262:in `run'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:263:in `block in run'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:263:in `map'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/example_group.rb:263:in `run'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/command_line.rb:24:in `block (2 levels) in run'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/command_line.rb:24:in `map'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/command_line.rb:24:in `block in run'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/reporter.rb:12:in `report'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/command_line.rb:21:in `run'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/runner.rb:80:in `run_in_process'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/runner.rb:69:in `run'
     # /home/jg/.rvm/gems/ruby-1.9.2-p0/gems/rspec-core-2.6.4/lib/rspec/core/runner.rb:11:in `block in autorun'