title: Installed gem but getting cannot load such file
body: <p>I have done the following</p>
  
  <pre><code>gem install crack
  </code></pre>
  
  <p>And added </p>
  
  <pre><code>gem 'crack'
  </code></pre>
  
  <p>To my gemfile.</p>
  
  <p>I am then requiring <code>require 'crack'</code></p>
  
  <p>The error I get when I try and load the route is</p>
  
  <pre><code>cannot load such file -- crack
  </code></pre>
  
  <p>I have run <code>gem environment</code> and get the following</p>
  
  <pre><code>RubyGems Environment:
  - RUBYGEMS VERSION: 2.2.2
  - RUBY VERSION: 2.1.0 (2013-12-25 patchlevel 0) [x86_64-darwin12.0]
  - INSTALLATION DIRECTORY: /Users/joshuahornby/.rvm/gems/ruby-2.1.0
  - RUBY EXECUTABLE: /Users/joshuahornby/.rvm/rubies/ruby-2.1.0/bin/ruby
  - EXECUTABLE DIRECTORY: /Users/joshuahornby/.rvm/gems/ruby-2.1.0/bin
  - SPEC CACHE DIRECTORY: /Users/joshuahornby/.gem/specs
  - RUBYGEMS PLATFORMS:
  - ruby
  - x86_64-darwin-12
  - GEM PATHS:
   - /Users/joshuahornby/.rvm/gems/ruby-2.1.0
   - /Users/joshuahornby/.rvm/gems/ruby-2.1.0@global
  - GEM CONFIGURATION:
   - :update_sources =&gt; true
   - :verbose =&gt; true
   - :backtrace =&gt; false
   - :bulk_threshold =&gt; 1000
   - "gem" =&gt; "--no-document"
  - REMOTE SOURCES:
   - https://rubygems.org/
  - SHELL PATH:
   - /Users/joshuahornby/.rvm/gems/ruby-2.1.0/bin
   - /Users/joshuahornby/.rvm/gems/ruby-2.1.0@global/bin
   - /Users/joshuahornby/.rvm/rubies/ruby-2.1.0/bin
   - /Users/joshuahornby/.rvm/bin
   - /Applications/MAMP/bin/php/php5.5.3/bin
   - /usr/bin
   - /bin
   - /usr/sbin
   - /sbin
   - /usr/local/bin
  </code></pre>
  
  <p>Error trace</p>
  
  <pre><code>activesupport (4.0.3) lib/active_support/dependencies.rb:229:in `require'
  activesupport (4.0.3) lib/active_support/dependencies.rb:229:in `block in require'
  activesupport (4.0.3) lib/active_support/dependencies.rb:212:in `block in load_dependency'
  activesupport (4.0.3) lib/active_support/dependencies.rb:616:in `new_constants_in'
  activesupport (4.0.3) lib/active_support/dependencies.rb:212:in `load_dependency'
  activesupport (4.0.3) lib/active_support/dependencies.rb:229:in `require'
  app/controllers/currencies_controller.rb:3:in `&lt;class:CurrenciesController&gt;'
  app/controllers/currencies_controller.rb:1:in `&lt;top (required)&gt;'
  activesupport (4.0.3) lib/active_support/dependencies.rb:424:in `load'
  activesupport (4.0.3) lib/active_support/dependencies.rb:424:in `block in load_file'
  activesupport (4.0.3) lib/active_support/dependencies.rb:616:in `new_constants_in'
  activesupport (4.0.3) lib/active_support/dependencies.rb:423:in `load_file'
  activesupport (4.0.3) lib/active_support/dependencies.rb:324:in `require_or_load'
  activesupport (4.0.3) lib/active_support/dependencies.rb:463:in `load_missing_constant'
  activesupport (4.0.3) lib/active_support/dependencies.rb:184:in `const_missing'
  activesupport (4.0.3) lib/active_support/inflector/methods.rb:226:in `const_get'
  activesupport (4.0.3) lib/active_support/inflector/methods.rb:226:in `block in constantize'
  activesupport (4.0.3) lib/active_support/inflector/methods.rb:224:in `each'
  activesupport (4.0.3) lib/active_support/inflector/methods.rb:224:in `inject'
  activesupport (4.0.3) lib/active_support/inflector/methods.rb:224:in `constantize'
  activesupport (4.0.3) lib/active_support/dependencies.rb:535:in `get'
  activesupport (4.0.3) lib/active_support/dependencies.rb:566:in `constantize'
  actionpack (4.0.3) lib/action_dispatch/routing/route_set.rb:76:in `controller_reference'
  actionpack (4.0.3) lib/action_dispatch/routing/route_set.rb:66:in `controller'
  actionpack (4.0.3) lib/action_dispatch/routing/route_set.rb:44:in `call'
  actionpack (4.0.3) lib/action_dispatch/journey/router.rb:71:in `block in call'
  actionpack (4.0.3) lib/action_dispatch/journey/router.rb:59:in `each'
  actionpack (4.0.3) lib/action_dispatch/journey/router.rb:59:in `call'
  actionpack (4.0.3) lib/action_dispatch/routing/route_set.rb:680:in `call'
  rack (1.5.2) lib/rack/etag.rb:23:in `call'
  rack (1.5.2) lib/rack/conditionalget.rb:25:in `call'
  rack (1.5.2) lib/rack/head.rb:11:in `call'
  actionpack (4.0.3) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
  activerecord (4.0.3) lib/active_record/query_cache.rb:36:in `call'
   activerecord (4.0.3) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in `call'
   activerecord (4.0.3) lib/active_record/migration.rb:369:in `call'
   actionpack (4.0.3) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
   activesupport (4.0.3) lib/active_support/callbacks.rb:373:in `_run__3271670212178920711__call__callbacks'
   activesupport (4.0.3) lib/active_support/callbacks.rb:80:in `run_callbacks'
   actionpack (4.0.3) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
   actionpack (4.0.3) lib/action_dispatch/middleware/reloader.rb:64:in `call'
   actionpack (4.0.3) lib/action_dispatch/middleware/remote_ip.rb:76:in `call'
   actionpack (4.0.3) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
   actionpack (4.0.3) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
   railties (4.0.3) lib/rails/rack/logger.rb:38:in `call_app'
   railties (4.0.3) lib/rails/rack/logger.rb:20:in `block in call'
   activesupport (4.0.3) lib/active_support/tagged_logging.rb:67:in `block in tagged'
   activesupport (4.0.3) lib/active_support/tagged_logging.rb:25:in `tagged'
   activesupport (4.0.3) lib/active_support/tagged_logging.rb:67:in `tagged'
   railties (4.0.3) lib/rails/rack/logger.rb:20:in `call'
   actionpack (4.0.3) lib/action_dispatch/middleware/request_id.rb:21:in `call'
   rack (1.5.2) lib/rack/runtime.rb:17:in `call'
   activesupport (4.0.3) lib/active_support/cache/strategy/local_cache.rb:83:in `call'
  rack (1.5.2) lib/rack/lock.rb:17:in `call'
  actionpack (4.0.3) lib/action_dispatch/middleware/static.rb:64:in `call'
  railties (4.0.3) lib/rails/engine.rb:511:in `call'
  railties (4.0.3) lib/rails/application.rb:97:in `call'
  rack (1.5.2) lib/rack/lock.rb:17:in `call'
  rack (1.5.2) lib/rack/content_length.rb:14:in `call'
  rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service'
  /Users/joshuahornby/.rvm/rubies/ruby-2.0.0-p353/lib/ruby/2.0.0/webrick/httpserver.rb:138:in `service'
  /Users/joshuahornby/.rvm/rubies/ruby-2.0.0-p353/lib/ruby/2.0.0/webrick/httpserver.rb:94:in `run'
  /Users/joshuahornby/.rvm/rubies/ruby-2.0.0-p353/lib/ruby/2.0.0/webrick/server.rb:295:in `block in start_thread'
  This error occurred while loading the following files:
  crack
  </code></pre>
  
  <p>I am guessing it something to do with my ruby version?</p>