title: Cannot load such file -- ffi_c error in RubyMine
body: <p>I tried to run a simple script as follows to learn automation using watir-webdriver and Ruby. But I am getting no such class error -ffi_c. </p>
  
  <pre><code>class TestWatir
    require 'watir-webdriver'
    require 'cucumber'
    browser = Watir :: Browser.new :firefox
    browser.goto 'http://www.google.com'
  end
  </code></pre>
  
  <p>I've added Cucumber and Watir-webdriver gems and also checked there is ffi dependency in the external library.</p>