action failed the check_authorization

```ruby
Started GET "/about" for 127.0.0.1 at 2014-04-07 19:28:19 -0400
Processing by HighVoltage::PagesController#show as HTML
  Parameters: {"id"=>"about"}
  Rendered pages/about.html.erb within layouts/application (0.3ms)
  Rendered layouts/_navigation_links.html.erb (0.4ms)
  Rendered layouts/_navigation.html.erb (1.5ms)
  Rendered layouts/_messages.html.erb (0.0ms)
  Rendered layouts/_bottom_menu.html.erb (0.2ms)
Completed 500 Internal Server Error in 19.5ms

CanCan::AuthorizationNotPerformed - This action failed the
check_authorization because it does not authorize_resource. Add
skip_authorization_check to bypass this check.:
```