facebook connect pluggin

i am new to cake php
currently i am using CakePHP-Facebook-Plugin facebook

i have downloaded the pluggin and inserted that file in pluggin/
facebook folder in my app

i have changed my facebook.php file means all app detail i have
entered

now when i am running my app it shows the error

Notice (8): Undefined variable: facebook [APP/views/pages/home.ctp,
line 1]
Code | Context
include - APP/views/pages/home.ctp, line 1
View::_render() - CORE/cake/libs/view/view.php, line 723
View::render() - CORE/cake/libs/view/view.php, line 419
Controller::render() - CORE/cake/libs/controller/controller.php, line
909
PagesController::display() - CORE/cake/libs/controller/
pages_controller.php, line 83
Dispatcher::_invoke() - CORE/cake/dispatcher.php, line 204
Dispatcher::dispatch() - CORE/cake/dispatcher.php, line 171
[main] - APP/webroot/index.php, line 83

Fatal error: Call to a member function html() on a non-object in /home/
depasser/public_html/var/www/html/facebook_connect/app/views/pages/
home.ctp on line 1

what step should take i am totally confused....
can any one guide me about configuring the cakephp and solving this
error

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