i am trying to get FACEBOOK COVER via graph API, but i cant. My code is : `                `` try { 	
	`              `$requestCover = $fb->get('me?fields=cover'); //getting user Cover
                     $requestProfileCover=$fb->get('/me'); 	
                //	 $cover = $requestCover->getGraphUser(); 		
                //  $profile = $requestProfileCover->getGraphUser(); 	
                     } 
                    catch(Facebook\Exceptions\FacebookResponseException $e) {
                    echo ' error: ' . $e->getMessage(); 		
                    exit; 	
                     }
                    catch(Facebook\Exceptions\FacebookSDKException $e) { 	 		
                     echo 'Facebook SDK error: ' . $e->getMessage(); 		
                    exit; 	
                     }
 	                print_r($requestCover); 	// showing cover details on the screen 	
                    echo "<img src='".$requestCover['source']."'/>";