title: can't activate bcrypt-ruby (~> 3.0.0), already activated bcrypt-ruby-3.1.1. Make sure all dependencies are added to Gemfile
body: <p>I have Rails 4.0.0 app. When I run bundle install command there is no problem. This is my GemFile.</p>
  
  <pre><code>source 'https://rubygems.org'
  
  # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
  gem 'rails', '4.0.0'
  
  gem 'mysql2'
  
  # Use SCSS for stylesheets
  gem 'sass-rails', '~&gt; 4.0.0.rc2'
  
  # Use Uglifier as compressor for JavaScript assets
  gem 'uglifier', '&gt;= 1.3.0'
  
  # Use CoffeeScript for .js.coffee assets and views
  gem 'coffee-rails', '~&gt; 4.0.0'
  
  # See https://github.com/sstephenson/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', '~&gt; 1.2'
  
  group :doc do
    # bundle exec rake doc:rails generates the API under doc/api.
    gem 'sdoc', require: false
  end
  
  # Use ActiveModel has_secure_password
  # gem 'bcrypt-ruby', '~&gt; 3.0.0'
  
  # Use unicorn as the app server
  # gem 'unicorn'
  
  # Use Capistrano for deployment
  # gem 'capistrano', group: :development
  
  # Use debugger
  # gem 'debugger', group: [:development, :test]
  
  gem 'pry'
  gem 'devise', git: "https://github.com/plataformatec/devise.git", branch: 'rails4'
  gem 'bcrypt-ruby'
  gem 'simple_form'
  gem "therubyracer"
  gem "less-rails" #Sprockets (what Rails 3.1 uses for its asset pipeline) supports LESS
  gem "twitter-bootstrap-rails"
  gem 'simple_form'
  gem 'jquery-ui-rails'
  
  group :development, :test do
    gem 'rspec-rails', '~&gt; 2.0'
    gem 'cucumber-rails', :git =&gt; "https://github.com/cucumber/cucumber-rails.git", :branch =&gt; "master_rails4_test", :require =&gt; false
    gem 'database_cleaner'
    gem 'factory_girl'
    gem "factory_girl_rails", "~&gt; 4.0"
    gem "database_cleaner"
    gem "awesome_print"
  end
  </code></pre>
  
  <p>And this is my Gemfile.lock</p>
  
  <pre><code>GIT
    remote: https://github.com/cucumber/cucumber-rails.git
    revision: 5fa9da37ab05213d2f46029ea476e09104ffe281
    branch: master_rails4_test
    specs:
      cucumber-rails (1.3.1)
        capybara (&gt;= 1.1.2)
        cucumber (&gt;= 1.2.0)
        nokogiri (&gt;= 1.5.0)
        rails (&gt;= 3.0.0)
  
  GIT
    remote: https://github.com/plataformatec/devise.git
    revision: 6b5988d756d780903bf8c9ccb3e2b3b724ccebe8
    branch: rails4
    specs:
      devise (2.2.4)
        bcrypt-ruby (~&gt; 3.0)
        orm_adapter (~&gt; 0.1)
        railties (&gt;= 3.2.6, &lt; 5)
        warden (~&gt; 1.2.1)
  
  GEM
    remote: https://rubygems.org/
    specs:
      actionmailer (4.0.0)
        actionpack (= 4.0.0)
        mail (~&gt; 2.5.3)
      actionpack (4.0.0)
        activesupport (= 4.0.0)
        builder (~&gt; 3.1.0)
        erubis (~&gt; 2.7.0)
        rack (~&gt; 1.5.2)
        rack-test (~&gt; 0.6.2)
      activemodel (4.0.0)
        activesupport (= 4.0.0)
        builder (~&gt; 3.1.0)
      activerecord (4.0.0)
        activemodel (= 4.0.0)
        activerecord-deprecated_finders (~&gt; 1.0.2)
        activesupport (= 4.0.0)
        arel (~&gt; 4.0.0)
      activerecord-deprecated_finders (1.0.3)
      activesupport (4.0.0)
        i18n (~&gt; 0.6, &gt;= 0.6.4)
        minitest (~&gt; 4.2)
        multi_json (~&gt; 1.3)
        thread_safe (~&gt; 0.1)
        tzinfo (~&gt; 0.3.37)
      arel (4.0.0)
      atomic (1.1.10)
      awesome_print (1.1.0)
      bcrypt-ruby (3.1.1)
      builder (3.1.4)
      capybara (2.1.0)
        mime-types (&gt;= 1.16)
        nokogiri (&gt;= 1.3.3)
        rack (&gt;= 1.0.0)
        rack-test (&gt;= 0.5.4)
        xpath (~&gt; 2.0)
      coderay (1.0.9)
      coffee-rails (4.0.0)
        coffee-script (&gt;= 2.2.0)
        railties (&gt;= 4.0.0.beta, &lt; 5.0)
      coffee-script (2.2.0)
        coffee-script-source
        execjs
      coffee-script-source (1.6.3)
      commonjs (0.2.6)
      cucumber (1.3.4)
        builder (&gt;= 2.1.2)
        diff-lcs (&gt;= 1.1.3)
        gherkin (~&gt; 2.12.0)
        multi_json (~&gt; 1.7.5)
        multi_test (~&gt; 0.0.1)
      database_cleaner (1.0.1)
      diff-lcs (1.2.4)
      erubis (2.7.0)
      execjs (1.4.0)
        multi_json (~&gt; 1.0)
      factory_girl (4.2.0)
        activesupport (&gt;= 3.0.0)
      factory_girl_rails (4.2.1)
        factory_girl (~&gt; 4.2.0)
        railties (&gt;= 3.0.0)
      gherkin (2.12.0)
        multi_json (~&gt; 1.3)
      hike (1.2.3)
      i18n (0.6.4)
      jbuilder (1.4.2)
        activesupport (&gt;= 3.0.0)
        multi_json (&gt;= 1.2.0)
      jquery-rails (3.0.4)
        railties (&gt;= 3.0, &lt; 5.0)
        thor (&gt;= 0.14, &lt; 2.0)
      jquery-ui-rails (4.0.3)
        jquery-rails
        railties (&gt;= 3.1.0)
      json (1.8.0)
      less (2.3.2)
        commonjs (~&gt; 0.2.6)
      less-rails (2.3.3)
        actionpack (&gt;= 3.1)
        less (~&gt; 2.3.1)
      libv8 (3.11.8.17)
      mail (2.5.4)
        mime-types (~&gt; 1.16)
        treetop (~&gt; 1.4.8)
      method_source (0.8.1)
      mime-types (1.23)
      mini_portile (0.5.1)
      minitest (4.7.5)
      multi_json (1.7.7)
      multi_test (0.0.1)
      mysql2 (0.3.13)
      nokogiri (1.6.0)
        mini_portile (~&gt; 0.5.0)
      orm_adapter (0.4.0)
      polyglot (0.3.3)
      pry (0.9.12.2)
        coderay (~&gt; 1.0.5)
        method_source (~&gt; 0.8)
        slop (~&gt; 3.4)
      rack (1.5.2)
      rack-test (0.6.2)
        rack (&gt;= 1.0)
      rails (4.0.0)
        actionmailer (= 4.0.0)
        actionpack (= 4.0.0)
        activerecord (= 4.0.0)
        activesupport (= 4.0.0)
        bundler (&gt;= 1.3.0, &lt; 2.0)
        railties (= 4.0.0)
        sprockets-rails (~&gt; 2.0.0)
      railties (4.0.0)
        actionpack (= 4.0.0)
        activesupport (= 4.0.0)
        rake (&gt;= 0.8.7)
        thor (&gt;= 0.18.1, &lt; 2.0)
      rake (10.1.0)
      rdoc (3.12.2)
        json (~&gt; 1.4)
      ref (1.0.5)
      rspec-core (2.14.3)
      rspec-expectations (2.14.0)
        diff-lcs (&gt;= 1.1.3, &lt; 2.0)
      rspec-mocks (2.14.1)
      rspec-rails (2.14.0)
        actionpack (&gt;= 3.0)
        activesupport (&gt;= 3.0)
        railties (&gt;= 3.0)
        rspec-core (~&gt; 2.14.0)
        rspec-expectations (~&gt; 2.14.0)
        rspec-mocks (~&gt; 2.14.0)
      sass (3.2.9)
      sass-rails (4.0.0)
        railties (&gt;= 4.0.0.beta, &lt; 5.0)
        sass (&gt;= 3.1.10)
        sprockets-rails (~&gt; 2.0.0)
      sdoc (0.3.20)
        json (&gt;= 1.1.3)
        rdoc (~&gt; 3.10)
      simple_form (1.4.1)
      slop (3.4.5)
      sprockets (2.10.0)
        hike (~&gt; 1.2)
        multi_json (~&gt; 1.0)
        rack (~&gt; 1.0)
        tilt (~&gt; 1.1, != 1.3.0)
      sprockets-rails (2.0.0)
        actionpack (&gt;= 3.0)
        activesupport (&gt;= 3.0)
        sprockets (~&gt; 2.8)
      therubyracer (0.11.4)
        libv8 (~&gt; 3.11.8.12)
        ref
      thor (0.18.1)
      thread_safe (0.1.0)
        atomic
      tilt (1.4.1)
      treetop (1.4.14)
        polyglot
        polyglot (&gt;= 0.3.1)
      turbolinks (1.3.0)
        coffee-rails
      twitter-bootstrap-rails (2.2.7)
        actionpack (&gt;= 3.1)
        execjs
        rails (&gt;= 3.1)
        railties (&gt;= 3.1)
      tzinfo (0.3.37)
      uglifier (2.1.2)
        execjs (&gt;= 0.3.0)
        multi_json (~&gt; 1.0, &gt;= 1.0.2)
      warden (1.2.3)
        rack (&gt;= 1.0)
      xpath (2.0.0)
        nokogiri (~&gt; 1.3)
  
  PLATFORMS
    ruby
  
  DEPENDENCIES
    awesome_print
    bcrypt-ruby
    coffee-rails (~&gt; 4.0.0)
    cucumber-rails!
    database_cleaner
    devise!
    factory_girl
    factory_girl_rails (~&gt; 4.0)
    jbuilder (~&gt; 1.2)
    jquery-rails
    jquery-ui-rails
    less-rails
    mysql2
    pry
    rails (= 4.0.0)
    rspec-rails (~&gt; 2.0)
    sass-rails (~&gt; 4.0.0.rc2)
    sdoc
    simple_form
    therubyracer
    turbolinks
    twitter-bootstrap-rails
    uglifier (&gt;= 1.3.0)
  </code></pre>
  
  <p>When I run <code>rake sometask</code> , I faced with this problem,</p>
  
  <pre><code>You don't have bcrypt-ruby installed in your application. Please add it to your Gemfile and run bundle install
  rake aborted!
  can't activate bcrypt-ruby (~&gt; 3.0.0), already activated bcrypt-ruby-3.1.1. Make sure all dependencies are added to Gemfile.
  /Users/apple/.rvm/gems/ruby-2.0.0-p0@rails4/gems/bundler-1.3.5/lib/bundler/rubygems_integration.rb:224:in `block in replace_gem'
  /Users/apple/.rvm/gems/ruby-2.0.0-p0@rails4/gems/activemodel-4.0.0/lib/active_model/secure_password.rb:47:in `has_secure_password'
  /Users/apple/Projects/YH/multi-domains/app/models/super_admin_user.rb:2:in `&lt;class:SuperAdminUser&gt;'
  /Users/apple/Projects/YH/multi-domains/app/models/super_admin_user.rb:1:in `&lt;top (required)&gt;'
  /Users/apple/.rvm/gems/ruby-2.0.0-p0@rails4/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:423:in `load'
  /Users/apple/.rvm/gems/ruby-2.0.0-p0@rails4/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:423:in `block in load_file'
  /Users/apple/.rvm/gems/ruby-2.0.0-p0@rails4/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:615:in `new_constants_in'
  /Users/apple/.rvm/gems/ruby-2.0.0-p0@rails4/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:422:in `load_file'
  /Users/apple/.rvm/gems/ruby-2.0.0-p0@rails4/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:323:in `require_or_load'
  /Users/apple/.rvm/gems/ruby-2.0.0-p0@rails4/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:462:in `load_missing_constant'
  /Users/apple/.rvm/gems/ruby-2.0.0-p0@rails4/gems/activesupport-4.0.0/lib/active_support/dependencies.rb:183:in `const_missing'
  /Users/apple/Projects/YH/multi-domains/lib/tasks/generate_new_data.rake:3:in `block in &lt;top (required)&gt;'
  </code></pre>
  
  <p>How should I fix this? </p>