Error on Google calander.

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PHP

google-api

i cant solve a google calander API error.Fatal error: Call to undefined method Google_Service_Drive_FileList::getItems() in C:\xampp\htdocs\drive\GoogleCalender\index.php on line 13

What I have tried:

require_once 'google-api-php-client/src/Google/autoload.php';

session_start();

$client = new Google_Client();
$client->setAuthConfigFile('client_secret.json');
$client->addScope(Google_Service_Drive::DRIVE_METADATA_READONLY);

if (isset($_SESSION['access_token']) && $_SESSION['access_token']) {
$client->setAccessToken($_SESSION['access_token']);
$drive_service = new Google_Service_Drive($client);
$files_list = $drive_service->files->listFiles(array())->getItems();
echo json_encode($files_list);
} else {
$redirect_uri = 'http://' . $_SERVER['HTTP_HOST'] .'/drive'. '/GoogleCalender' . '/oauth2callback.php';
header('Location: ' . filter_var($redirect_uri, FILTER_SANITIZE_URL));
}
?>

require_once 'google-api-php-client/src/Google/autoload.php';

session_start();

$client = new Google_Client();
$client->setAuthConfigFile('client_secret.json');
$client->setRedirectUri('http://' . $_SERVER['HTTP_HOST'] .'/drive'. '/GoogleCalender' . '/oauth2callback.php');
$client->addScope(Google_Service_Drive::DRIVE_METADATA_READONLY);


if (! isset($_GET['code'])) {
$auth_url = $client->createAuthUrl();
header('Location: ' . filter_var($auth_url, FILTER_SANITIZE_URL));
} else {
$client->authenticate($_GET['code']);
$_SESSION['access_token'] = $client->getAccessToken();
$redirect_uri = 'http://' . $_SERVER['HTTP_HOST'] .'/drive'. '/GoogleCalender' . '/';
header('Location: ' . filter_var($redirect_uri, FILTER_SANITIZE_URL));
}
?>