[Rails] undefined method `key?' for nil:NilClass,bcrypt-ruby,has_secure_password

[mike]

I'm going through DHH's Agile Web Development with Rails for Rails 3.1. In 
chapter 14 they create a Users sign-in model/view/controller using the 
has_secure_password method. My user.rb file looks like this

    class User < ActiveRecord::Base
      attr_accessible :name, :password_digest, :password, :password_confirmation
      validates :name, presence: true, uniqueness: true
      has_secure_password
    end

now when I go to localhost:3000/users/new I first get some kind of 
bcrypt-ruby error and then when I reload the page I get a undefined method 
`key?' for nil:NilClass

I don't know what needs to be done, mike

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