没有要加载的此类文件-openid / store / filesystem（Rails omniauth）

Question

This is first time I'm trying to use Omniauth. While I was testing https://github.com/pt/devise-omniauth-example this example from github I came across an error

 .rvm/gems/ruby-1.9.2-p290/gems/activesupport-3.1.3/lib/active_support/dependencies.rb:240:in `require': no such file to load -- openid/store/filesystem (LoadError)

Here is my Gemfile content

source 'http://rubygems.org'

gem 'rake'
gem 'rails'
gem 'sqlite3-ruby', :require => 'sqlite3'
gem 'devise', :git => 'git://github.com/plataformatec/devise', :branch => 'master'
gem "omniauth", "1.0.1"
gem 'paperclip'
gem "simple_form", "~> 1.5.2"
gem 'twitter_oauth', '0.4.3'
gem "rest-client", "1.6.7", :require => "restclient"
gem "sluggable"


group :development, :test do
 gem 'rspec-rails'
 gem 'fixjour'
end

I search web but there was no luck.

Answer 1

According to this :

If you get "openid/store/filesystem (LoadError)" then you may need to add this to your Gemfile:

gem "oa-openid"

Answer 2

This is due to various versions of Gems you are using and the dependencies among them.
In the example at https://github.com/pt/devise-omniauth-example ,
if you notice the Gemfile ,there is

gem 'omniauth', '0.2.0'

but in your Gemfile above, you are using

gem "omniauth", "1.0.1"

Answer 3

Add gem 'ruby-openid-apps-discovery' , and add below in application.rb .

require 'omniauth-openid'
require 'openid'
require 'openid/store/filesystem'
require 'gapps_openid'