title: rails-rspec error cannot load such file -- rspec/core/formatters/progress_formatter
body: <p>I've broken my rails-rspec. I switched to a different gemset to run a 3rd party test. When I returned to my 2.3.0(default) gemset, I had the following errors.</p>
  <p>running rspec gets:</p>
  <pre><code>/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require': cannot load such file -- rspec/core/formatters/progress_formatter (LoadError)
  </code></pre>
  <p>running rails generate rspec:install returns:</p>
  <pre><code>Could not find generator 'rspec:install'. Maybe you meant 'devise:install' or ...
  </code></pre>
  <p>I have tried uninstalling and reinstalling, but errors persist.</p>
  <p>Running <code>rspec -v</code> returns:</p>
  <pre><code>- rspec-core 3.6.0
  - rspec-expectations 3.6.0
  - rspec-mocks 3.6.0
  - rspec-rails 3.6.1
  - rspec-support 3.6.0
  </code></pre>
  <p>It seems that ruby cannot find rspec-core. I have tried the workaround from <a href="https://stackoverflow.com/questions/45673087/cant-find-gem-rspec-core-0-a-gemgemnotfoundexception-when-running-on-j">this post</a> without success. Thank you in advance for any insight you might provide.</p>
  <p>Running</p>
  <blockquote>
  <p>rails 4.2.0, ruby 2.3.0</p>
  </blockquote>