Validator not quite working

Hi guys,
I’m trying to get the form validator to work - and it almost does. What
happens, I believe, is that it throws the error properly, but it never
makes it back to the page to post the error. Instead, it kind of blows
up.

I used the same basic code the scaffold uses, so I’m not sure why it’s
not working. If you guys wouldn’t mind… controller = Signups, model =
Customer

Cheers. And thanks in advance!

The error message:
http://farm4.static.flickr.com/3259/3120802163_cefc0d789f_o.jpg

SignupsController
http://www.pastie.org/343627

Index View
http://www.pastie.org/343631

Customer model

class Customer < ActiveRecord::Base
validates_presence_of :first_name, :last_name, :email
end