使用expect方法时，参数数量错误（给定1，预期为0）

Question

这是我的代码

describe "my page", :type => :feature, :js => true do

  before(:each) do
    visit EnvConfig.get :app_url
  end

  it { expect(page).to match_expectation }

end

尝试添加gem并使用它https://github.com/rprt/rspec-page-regression

错误

Failures:

1) my page should match expectation
  Failure/Error: it { expect(page).to match_expectation }

ArgumentError:
  wrong number of arguments (given 1, expected 0)
  # ./spec/features/login_spec.rb:7:in `block (2 levels) in <top (required)>'

Finished in 3.24 seconds (files took 0.90062 seconds to load)
1 example, 1 failure

Failed examples:
rspec ./spec/features/login_spec.rb:7 # my page should match expectation

spec_helper.rb文件有下一个要求

require 'capybara' 
require 'capybara/dsl' 
require 'capybara/rspec' 
require 'rspec' 
require 'rspec/page-regression'
require 'selenium-webdriver' 
require 'site_prism' 
require 'env_config' 
require 'active_support/all'

以及config.javascript_driver =：selenium