[Rails] undefined method `original_filename' for nil:NilClass

Hi, although I saw this problem in other blogs, I couldn't make it works.

My view:

<%= semantic_form_for :routes_status_race, :url => status_race_admin_routes_path do |f| %>

<% contact_array = Contact.all.map {|contact| [contact.name, contact.id]}%>

  <% route_importer_array = RouteImporter.all.map {|importer| [importer.name, importer.id]}%>

  <%= f.inputs do%>

  <%= f.input :contact, :as => :select, :collection => Contact.all %>

  <%= f.input :route_import, :as => :select, :collection => RouteImporter.all %>

        <%= f.input :uploaded_data, :action => :status_race, :multipart => true, :as => :file %>

  <%end%>

  <input name='commit' type='submit' method='post' value='Import'/>

<%end%>

My controller:

 collection_action :status_race, :method => :post do

    uploaded_io = params[:uploaded_data].original_filename

    File.open(Rails.root.join('app/importers', 'uploads', uploaded_io.original_filename), 'w') do |file|

      file.write(uploaded_io.read)

    end

    RoutesQuickcom.new.run(uploaded_io.original_filename)

    render "status_race"

  end

end

I don't know how to fix it , any help will be appreciate, thanks!

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