can not load omniauth in rails application - ruby-on-rails-3

Question

I am following rails 3 in action's source code,when I run the app,I get the following error:
[DEVISE] Devise.use_salt_as_remember_token is deprecated and has no effect. Please remove it.
Could not load 'omniauth'. Please ensure you have the omniauth gem >= 1.0.0 installed and listed in your Gemfile.
Exiting
This is the gem file:
gem 'rails', '3.2.8'
# gem 'arel'
gem 'rack'
gem 'sprockets'
gem 'sqlite3'
gem 'sass', '~> 3.1.0.alpha'
gem 'coffee-script'
gem 'dynamic_form'
gem 'devise'
gem 'cancan'
gem 'paperclip'
gem 'searcher'
gem 'kaminari'
gem 'jquery-rails'
gem "oa-oauth", :require => "omniauth/oauth"
gem "delayed_job"
# gem "forem"
gem "ticketee-forem"
gem 'sinatra'
group :test, :development do
gem 'gmail'
gem 'rspec-rails', '~> 2.6.1.beta1'
end
group :test do
gem 'rack-test'
gem 'cucumber-rails'
gem 'capybara'
gem 'database_cleaner'
gem 'factory_girl'
gem 'email_spec'
gem 'launchy'
end
group :production do
gem 'pg'
end
When I run bundle check it will success.
And my gem list:
*** LOCAL GEMS ***
actionmailer (3.2.8)
actionpack (3.2.8)
activemodel (3.2.8)
activerecord (3.2.8)
activeresource (3.2.8)
activesupport (3.2.8)
addressable (2.2.8)
arel (3.0.2)
bcrypt-ruby (3.0.1)
builder (3.0.2)
bundler (1.1.4)
cancan (1.6.8)
capybara (1.1.2)
childprocess (0.3.5)
cocaine (0.3.0)
coffee-script (2.2.0)
coffee-script-source (1.3.3)
cucumber (1.0.6)
cucumber-rails (1.0.2)
database_cleaner (0.8.0)
delayed_job (3.0.3)
devise (2.1.2)
diff-lcs (1.1.3)
dynamic_form (1.1.4)
email_spec (1.2.1)
erubis (2.7.0)
execjs (1.4.0)
factory_girl (4.0.0)
faraday (0.6.1)
ffi (1.1.5)
gherkin (2.4.21)
gmail (0.4.0)
gmail_xoauth (0.3.2)
hike (1.2.1)
i18n (0.6.1)
journey (1.0.4)
jquery-rails (2.1.2)
json (1.7.5)
kaminari (0.14.0)
launchy (2.1.0)
libwebsocket (0.1.5)
mail (2.4.4)
mime (0.1)
mime-types (1.19)
multi_json (1.3.6)
multipart-post (1.1.5)
mysql2 (0.3.11)
nokogiri (1.4.7)
oa-core (0.2.4)
oa-oauth (0.2.4)
oauth (0.4.7)
oauth2 (0.4.1)
orm_adapter (0.4.0)
paperclip (3.2.0)
pg (0.14.1)
polyglot (0.3.3)
rack (1.4.1)
rack-cache (1.2)
rack-protection (1.2.0)
rack-ssl (1.3.2)
rack-test (0.6.1)
rails (3.2.8)
railties (3.2.8)
rake (0.9.2.2)
rdoc (3.12)
rspec (2.6.0)
rspec-core (2.6.4)
rspec-expectations (2.6.0)
rspec-mocks (2.6.0)
rspec-rails (2.6.1)
rubygems-bundler (1.0.2)
rubyzip (0.9.9)
rvm (1.11.3.3)
sass (3.1.21)
searcher (0.0.6)
selenium-webdriver (2.25.0)
sinatra (1.3.3)
sprockets (2.1.3)
sqlite3 (1.3.6)
term-ansicolor (1.0.7)
thor (0.16.0)
ticketee-forem (0.0.1)
tilt (1.3.3)
treetop (1.4.10)
tzinfo (0.3.33)
warden (1.2.1)
xpath (0.1.4)
As you can see, I do have the gem oa-oauth (0.2.4) installed.
Why does it give me this error?

Answer 1

oa-oauth is not the omniauth gem ... It's the oauth extension for omniauth ... Add the omniauth gem gem 'omniauth', just like the error message tells you ...