rendering haml problem

gistfile1.rb

def new
...
...
  if params[:embed]
     render_embedded :template => 'reservations/embedded/new'
  elsif params[:popup]
     render :layout => 'standalone', :template => 'reservations/new_popup' # this cause an error: Missing template reservations/new_popup.erb in view path app/views:vendor/plugins/devise/app/views
  else              
     render :layout => 'standalone'
  end

end

# error trace
Processing ReservationsController#new (for 93.172.57.209 at 2012-06-07 13:22:38) [GET]
Parameters: {"popup"=>"true", "action"=>"new", "protocol"=>"https", "url"=>"some_url", "controller"=>"reservations", "offer_id"=>"603"}
Rendering template within layouts/standalone
Rendering reservations/new_popup
ActionView::MissingTemplate (Missing template reservations/new_popup.erb in view path app/views:vendor/plugins/devise/app/views):
.gems/gems/actionpack-2.3.11/lib/action_view/paths.rb:74:in `find_template'
.gems/gems/actionpack-2.3.11/lib/action_view/base.rb:264:in `render_without_haml'
.gems/gems/haml-3.1.4/rails/./lib/haml/helpers/action_view_mods.rb:13:in `render'
.gems/gems/actionpack-2.3.11/lib/action_view/base.rb:348:in `_render_with_layout'

# views tree (compressed)
├── layouts
│   ├── admin
│   │   ├── _footer.haml
│   │   └── _header.haml
│   ├── admin.haml
│   ├── application
│   │   ├── _footer.haml
│   │   └── _header.haml
│   ├── application.haml
│   ├── common
│   │   ├── _account_info.haml
│   │   ├── _api_key.haml
│   │   ├── _errors.haml
│   │   ├── _flashes.haml
│   │   ├── _sharing.haml
│   │   └── _support_box.haml
├── reservations
│   ├── common
│   │   └── _merchant_info.haml
│   ├── embedded
│   │   ├── 3d_secure_redirect.haml
│   │   ├── new.haml
│   │   └── show.haml
│   ├── new.haml
│   ├── new_popup.haml
│   └── show.haml