Rails - Jun 2014 - text_field_tag doesn't display after upgrade Rails from 2.3.18 to 4.0.4

Hi, 

I developed a few simple apps using Ruby On Rails (no database) for 
researchers, we
got a new server (Mac Pro) and I try to develop in rails 4.0.4, I have this 
piece of
code in index.rhtml, but not anymore if I copy it to index.html.erb, I 
don't get
any error, but text_field_tag and submit_tag are not displaying, I read 
manuals
about form_tag, text_field_tag and submit_tag, they don't seem to change
much, what I might be doing wrong? Thanks a lot for your advice.

  <td valign=top>
    <h3>Sample size calculation</h3>
      <% form_tag('/progress') do %> 
      <table cellspacing=3 cellpadding=3>

        <tr>
          <td> Condition Number : </td><td><%=
text_field_tag( "cond",
value = nil, :size => "10" )    %></td>
        </tr>

        <tr>
          <td> Number of People : </td><td><%=
text_field_tag( "no", value
= nil, :size => "10" )    %></td>
        </tr>

        <tr>
          <td> <div><%= submit_tag "Compute"
%></div></p>
        </tr>
      </table>
    <% end %>

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