can't populate db using rake db:populate

can't populate db using rake db:populate

I am trying to populate my db using rake db:populate. I am on chapter
10.3.2 on michael hartl's book.
Even though I don't get any error messages the DB doesn't seem to be
populating.
This is the sample_data.rake file I created:
Blockquote
namespace :db do desc "Fill database with sample data" task populate:
:environment do User.create!(:name => "Example User", :email =>
"example@railstutorial.org", :password => "foobar", :password_confirmation
=> "foobar") 99.times do |n| name = Faker::Name.name email =
"example-#{n+1}@railstutorial.org" password = "password"
User.create!(:name => name, :email => email, :password => password,
:password_confirmation => password) end end end
Blockquote