[Radiant] snapshot extension with 0.9.1

[Erasmo da Narni]

hi! i've installed the snapshot extension, and i get the following error:

Processing Admin::SnapshotController#create (for 127.0.0.1 at 2011-07-15 
16:21:15) [POST]
  Parameters: {"action"=>"create", 
"authenticity_token"=>"Qm9QSKiXMgml4Q/+G9BQb2bANhb4mnxlTx8+V+UgZQ4=", 
"controller"=>"admin/snapshot"}
NoMethodError (undefined method `redirect' for nil:NilClass):
  vendor/extensions/index_page/app/models/index_page.rb:8:in `render'
  
vendor/extensions/snapshot/app/controllers/admin/snapshot_controller.rb:24:in 
`create'
  
vendor/extensions/snapshot/app/controllers/admin/snapshot_controller.rb:23:in 
`each'
  
vendor/extensions/snapshot/app/controllers/admin/snapshot_controller.rb:23:in 
`create'
  radiant (0.9.1) vendor/plugins/haml/rails/./lib/sass/plugin/rails.rb:20:in 
`process'
Rendering rescues/layout (internal_server_error)

any ideas on how to fix this?

tia.