baffling error

gistfile1.txt

Showing /home/andrew/Documents/FestivePage/app/views/mailouts/_form.html.haml where line #3 raised:

wrong number of arguments (1 for 0)

Extracted source (around line #3):

1: .group
2:   = f.label :subject, t("activerecord.attributes.mailout.subject", :default => "Subject"), :class => :label
3:   = f.text_field :subject, :class => 'text_field'
4:   %span.description Ex: a simple text
5: .group


# being called from my new view 

    .inner
      = form_for :mailout, :url => mailouts_path, :html => { :class => :form } do |f|
        = render :partial => "form", :locals => {:f => f}
- content_for :sidebar, render(:partial => 'sidebar')