title: Gem is installed but not loading
body: <p>I have installed the <code>api_auth</code> with <code>gem install api_auth</code></p>
  
  <p>but when I try to run a file that <code>require api_auth</code>, it tells me it's missing :</p>
  
  <pre><code>/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- active_support/dependencies (LoadError)
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /Library/Ruby/Gems/2.0.0/gems/api_auth-0.0.2.4/lib/api_auth.rb:1:in `&lt;top (required)&gt;'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:135:in `require'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:135:in `rescue in require'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:144:in `require'
  from /Users/thomasbentkowski/Documents/misc/apisandbox.rb:3:in `&lt;top (required)&gt;'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
  from /Library/Ruby/Gems/2.0.0/gems/pry-0.10.4/lib/pry/pry_class.rb:91:in `block in load_requires'
  from /Library/Ruby/Gems/2.0.0/gems/pry-0.10.4/lib/pry/pry_class.rb:90:in `each'
  from /Library/Ruby/Gems/2.0.0/gems/pry-0.10.4/lib/pry/pry_class.rb:90:in `load_requires'
  from /Library/Ruby/Gems/2.0.0/gems/pry-0.10.4/lib/pry/pry_class.rb:128:in `initial_session_setup'
  from /Library/Ruby/Gems/2.0.0/gems/pry-0.10.4/lib/pry/cli.rb:206:in `block in &lt;top (required)&gt;'
  from /Library/Ruby/Gems/2.0.0/gems/pry-0.10.4/lib/pry/cli.rb:83:in `call'
  from /Library/Ruby/Gems/2.0.0/gems/pry-0.10.4/lib/pry/cli.rb:83:in `block in parse_options'
  from /Library/Ruby/Gems/2.0.0/gems/pry-0.10.4/lib/pry/cli.rb:83:in `each'
  from /Library/Ruby/Gems/2.0.0/gems/pry-0.10.4/lib/pry/cli.rb:83:in `parse_options'
  from /Library/Ruby/Gems/2.0.0/gems/pry-0.10.4/bin/pry:16:in `&lt;top (required)&gt;'
  from /usr/local/bin/pry:23:in `load'
  from /usr/local/bin/pry:23:in `&lt;main&gt;'
  </code></pre>
  
  <p>Here's the result of <code>gem environment</code></p>
  
  <pre><code>- RUBYGEMS VERSION: 2.0.14.1
    - RUBY VERSION: 2.0.0 (2015-12-16 patchlevel 648) [universal.x86_64-darwin16]
    - INSTALLATION DIRECTORY: /Library/Ruby/Gems/2.0.0
    - RUBY EXECUTABLE: /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby
    - EXECUTABLE DIRECTORY: /usr/local/bin
    - RUBYGEMS PLATFORMS:
      - ruby
      - universal-darwin-16
    - GEM PATHS:
       - /Library/Ruby/Gems/2.0.0
       - /Users/thomasbentkowski/.gem/ruby/2.0.0
       - /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/gems/2.0.0
    - GEM CONFIGURATION:
       - :update_sources =&gt; true
       - :verbose =&gt; true
       - :backtrace =&gt; false
       - :bulk_threshold =&gt; 1000
    - REMOTE SOURCES:
       - https://rubygems.org/
  </code></pre>