ReferenceError: Can't find variable: jQuery with Poltergeist/Capybara

What I'm trying to Do

I'm trying to use capybara with poltergeist to log into amazon at this url...

https://developer.amazon.com/rp/sales.html

Simple enough, except that when I try to submit the form, I get the error... ReferenceError: Can't find variable: jQuery ...

However, the source for jQuery is in the page and should have been loaded.

The code I'm using to log in is this...

  visit "https://developer.amazon.com/rp/sales.html"
  fill_in('ap_email', with: user)
  fill_in('ap_password', with: password)
  click_on('signInSubmit-input')

Submit triggers a javascript call to validate input. This uses jQuery and when it does, the error is thrown.

What I Expected

I expected that when I visited the login page, that jquery would have been loaded with the other javascripts on that page.

I have no idea why jQuery would not be loaded at this point. Phantomjs would have loaded the page and loaded the jQuery referenced in the page, no?

Things I've Tried

Timing Issue? - Added sleep after visit.

Configuration Issue?

• My Current Configuration

  include Capybara::DSL
  Capybara.default_driver = :poltergeist
  Capybara.register_driver :poltergeist do |app|
      Capybara::Poltergeist::Driver.new(app, phantomjs: Phantomjs.path)
  end
  Capybara.ignore_hidden_elements = false
  

• Attempting to Force jQuery to Load

  Capybara::Poltergeist::Driver.new(app,
                                phantomjs: Phantomjs.path,
                                extensions: ["handlers/jquery.js"])
  

I've tried quite a few things in an attempt to get my head around what's going on but I'm coming up empty.

Any thoughts on where I might look or what may be going on would be greatly appreciated.

from ReferenceError: Can't find variable: jQuery with Poltergeist/Capybara