scaffolding and date_select issues

I've started a fresh new app via SSH

here's what I typed: $ rails test

cd test

$ ruby script/generate scaffold Evento nombre:string locacion:text fecha:date

when I try to create a new 'evento' from the Eventos listing I get the following error:

NoMethodError in Eventos#new

Showing eventos/new.html.erb where line #13 raised:

undefined method `fecha' for #<Evento id: nil, nombre: nil, locacion:

Extracted source (around line #13):

10: 11: <p> 12: <b>Fecha</b><br /> 13: <%= f.date_select :fecha %> 14: 15: 16: </p>

I've tried changing the line 13, like this:

<%= date_select( "fiesta", "fecha", :start_year => 2008 ) %>

but it doesn't work either. I can't see where's the error. can you help me please? I have rails 2.0, ruby 1.8.6 running in my server ( a bluehost.com hosting account)