[Rails] Form not working...

Hello. I created a form and it always throw the 'Title can't be blank'
error, even if I filled it.

What is wrong?

Thanks,

Gabriel.

----------------------------

# new.html.erb
<h1>Welcome</h1>

<% form_for(@sfile) do |f| %>
  <%= f.error_messages %>

  <p>
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </p>
  <p>
    <%= f.label :description %><br />
    <%= f.text_area :description %>
  </p>
  <p>
    <%= f.submit 'Create' %>
  </p>
<% end %>

----

# sfile.rb
class Sfile < ActiveRecord::Base
         validates_presence_of :title
end


---

# sfiles_controller.rb
class SfilesController < ApplicationController
         def new
                 @sfile = Sfile.new
         end

         def create
                 @sfile = Sfile.new(params[:product])
                 respond_to do |format|
                         if @sfile.save
                                 flash[:notice] = 'File was successfully 
created.'
                                 format.html { redirect_to(@sfile) }
                         else
                                 format.html { render :action => "new" }
                         end
                 end
         end

         def show
                 @sfile = Sfile.find(params[:id])
         end
end
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