Cakephp blog tutorial error

Hi there,

I followed this tutorial, everything is working fine apart from the "edit method" when click the edit link it gives following warning message. I am new to cakephp and php. 

Warning (2): strtolower() expects parameter 1 to be string, array given [CORE/Cake/Network/CakeRequest.php, line 471]
Code Context
$type = array(  	(int) 0 => 'post',  	(int) 1 => 'put'  )  $this = object(CakeRequest) {  	params => array(  		'plugin' => null,  		'controller' => 'posts',  		'action' => 'edit',  		'named' => array([maximum depth reached]),  		'pass' => array(  			[maximum depth reached]  		)  	)  	data => array()  	query => array()  	url => 'posts/edit/2'  	base => '/cake_2_0'  	webroot => '/cake_2_0/'  	here => '/cake_2_0/posts/edit/2'  }
strtolower - [internal], line ??  CakeRequest::is() - CORE/Cake/Network/CakeRequest.php, line 471  PostsController::edit() - APP/Controller/PostsController.php, line 48  ReflectionMethod::invokeArgs() - [internal], line ??  Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 485  Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 186  Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 161  [main] - APP/webroot/index.php, line 92

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