If you look at simple_form_bootstrap.rb, you see:
```rails
  config.wrappers :bootstrap, tag: 'div', class: 'control-group', error_class: 'error' do |b|
    b.use :html5
    b.use :placeholder
    b.use :label
    b.wrapper tag: 'div', class: 'controls' do |ba|
      ba.use :input
      ba.use :error, wrap_with: { tag: 'span', class: 'help-inline' }
      ba.use :hint,  wrap_with: { tag: 'p', class: 'help-block' }
    end
  end
```

The main thing to note is the fact that the class is always supplied for the error. I think Foundation needs the same or else we run into issues.