```ruby
require 'blacklight'
require 'geoblacklight'

module StashDiscovery
  class Engine < ::Rails::Engine
  end
end
```

Add explicit require for sass-rails
user
```ruby
require 'blacklight'
require 'geoblacklight'

# For undocumented reasons, sass-rails won't load without an explicit require
require 'sass-rails'

module StashDiscovery
  class Engine < ::Rails::Engine
  end
end
```
assistant