Rails - Jun 2012 - undefined method `xxx_path' for #<#<Class....

when i try  /contact_mail/newi it return me error: undefined local variable 
or method `em'' for
#<#<Class:0x007fca24248858>:0x007fca21186df0>





model: contact_mail.rg
class ContactMail < ActiveRecord::Base
  attr_accessible :email, :message, :name, :subject

end

controler: contarct_mail_controller.rb
class ContactMailController < ApplicationController
 def new 
    @em=ContactMail.new
  end
  
  def create
    @em = ContactMail.new(params[:contact_mail])
    @em.save
  end
    
end


view: new.html.erb
<%= form_for(@em) do |f| %>
<div class="field">
<%= f.label :email %>
<%= f.text_field :email%><br />
<br />
</div>
<div class="actions">
<%= f.submit "wyslij" %><br />
</div>
<% end %>



when i add @em.save to def new in controller it pass but i''t not the
way i
want to do it.
Do enyone know how can i fix it? or what is wrong with my solution? 

i had made 4 model and controllers allrady using this method and it works 
perfetly. 

i had add resources :contact_mail to routes. 




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