[Rails] ruby on rails 3 tutorial book chapter9 Signin Failure

Hi I have problem trying to pass the signin failure test.

This is the test code of the sessions_controller.rb

def create
user = User.authenticate(params[:session][:email],
params[:session][:password])
if user.nil?
flash.now[:error] = "Invalid email/password combination."
@title = "Sign in"
render 'new'
else
# Sign the user in and redirect to the user's show page.
end
end

If I check in my browser and clic on submit with all fields empty, I
get the following error:

NoMethodError in SessionsController
#create undefined method `nil' for nil:NilClass

I check the book many times and I have code exactly as the book, but I
still have the error. Any help???

You can check the code in this link listing 9.8
http://ruby.railstutorial.org/chapters/sign-in-sign-out#sec:signin_failure

What I doing wrong?

Thanks for any help.

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