How can i install alchemy-spree ?

[Rijo George]

Im trying to install alchemy-spree, i will explain the step i did:

1. Created a new Rails Project
2. Installed alchemy_cms
3 Installed Spree.

But after that, when i installed gem 'alchemy_spree' and started rails server, getting error:

    ".rvm/gems/ruby-2.2.1/gems/alchemy_spree-0.1.5/lib/alchemy_spree/alchemy_module.rb:16:in `<top (required)>': uninitialized constant Alchemy::AuthEngine (NameError)"

Could you help What all steps i need to have in alchemy-spree installation ?
(im using this guide, https://github.com/AlchemyCMS/alchemy_spree)

My Gem file:
 
source 'https://rubygems.org'


# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.2.4'
# Use mysql as the database for Active Record
gem 'mysql2', '~> 0.3.18'  #ADD THIS BECAUSE AN ERROR SHOWS
#Alchemy gems
gem 'alchemy_cms', '~>3.2.0'
#gem 'alchemy-devise', '~> 3.2.0'
gem 'alchemy-devise', '~> 3.2.0'
# Use SCSS for stylesheets
gem 'sass-rails', '~> 5.0'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
# Use CoffeeScript for .coffee assets and views
gem 'coffee-rails', '~> 4.1.0'
# See https://github.com/rails/execjs#readme for more supported runtimes
# gem 'therubyracer', platforms: :ruby

# Use jquery as the JavaScript library
gem 'jquery-rails'
# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
# bundle exec rake doc:rails generates the API under doc/api.
gem 'sdoc', '~> 0.4.0', group: :doc

# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use Unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano-rails', group: :development

group :development, :test do
  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
  gem 'byebug'
end

group :development do
  # Access an IRB console on exception pages or by using <%= console %> in views
  gem 'web-console', '~> 2.0'

  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
  gem 'spring'
end


gem 'spree', '3.0.4'
#gem 'spree_gateway', github: 'spree/spree_gateway', branch: '3-0-stable'
#gem 'spree_auth_devise', github: 'spree/spree_auth_devise', branch: '3-0-stable'

gem 'spree_gateway', github: 'spree/spree_gateway', branch: '3-0-stable'
#gem 'alchemy-richmedia-essences', github: 'magiclabs/alchemy-richmedia-essences'
gem 'alchemy_spree'

gem 'spree_auth_devise', github: 'spree/spree_auth_devise', branch: '3-0-stable'