After a successfull setup of microsoft azure portal trying to run php connect sample which is basically in laravel giving me hard time?

Trying to run laravel based [php connect sample] provided by microsoft github when i run this laravel project on local facing 3 steps the problem is in third step as mention in the screen shot i am also going to prvide screen shot of logincontroller.php

url after connecting microsoft portal is

http://localhost:8000/oauth.php?code=xxxxxxxxxxxxxstate=xxxxxxxxxxxxxxx&session_state=xxxxxxxxxxxxx

ErrorException in LoginController.php line 66: Undefined index: state

LoginController.php file code

namespace App\Http\Controllers;

use Microsoft\Graph\Connect\Constants;

class LoginController extends Controller {

public function oauth()
{
    session_start();
    //We store user name, id, and tokens in session variables
    if (session_status() == PHP_SESSION_NONE) {
        session_start();
    }

    $provider = new \League\OAuth2\Client\Provider\GenericProvider([
        'clientId'                => Constants::CLIENT_ID,
        'clientSecret'            => Constants::CLIENT_SECRET,
        'redirectUri'             => Constants::REDIRECT_URI,
        'urlAuthorize'            => Constants::AUTHORITY_URL . Constants::AUTHORIZE_ENDPOINT,
        'urlAccessToken'          => Constants::AUTHORITY_URL . Constants::TOKEN_ENDPOINT,
        'urlResourceOwnerDetails' => '',
        'scopes'                  => Constants::SCOPES
    ]);

    if ($_SERVER['REQUEST_METHOD'] === 'GET' && !isset($_GET['code'])) {
        $authorizationUrl = $provider->getAuthorizationUrl();

        // The OAuth library automaticaly generates a state value that we can
        // validate later. We just save it for now.
        $_SESSION['state'] = $provider->getState();

        header('Location: ' . $authorizationUrl);
        exit();
    } elseif ($_SERVER['REQUEST_METHOD'] === 'GET' && isset($_GET['code'])) {
        // Validate the OAuth state parameter

        if (empty($_GET['state']) || ($_GET['state'] !== $_SESSION['state'])) {
            unset($_SESSION['state']);
            exit('State value does not match the one initially sent');
        }

        // With the authorization code, we can retrieve access tokens and other data.
        try {
            // Get an access token using the authorization code grant
            $accessToken = $provider->getAccessToken('authorization_code', [
                'code'     => $_GET['code']
            ]);



            $_SESSION['access_token'] = $accessToken->getToken();

            // The id token is a JWT token that contains information about the user
            // It's a base64 coded string that has a header, payload and signature
            $idToken = $accessToken->getValues()['id_token'];
            $decodedAccessTokenPayload = base64_decode(
                explode('.', $idToken)[1]
            );
            $jsonAccessTokenPayload = json_decode($decodedAccessTokenPayload, true);

            // The following user properties are needed in the next page
            $_SESSION['preferred_username'] = $jsonAccessTokenPayload['preferred_username'];
            $_SESSION['given_name'] = $jsonAccessTokenPayload['name'];

            header('Location: http://localhost:8000/email');
            exit();
        } catch (League\OAuth2\Client\Provider\Exception\IdentityProviderException $e) {
            echo 'Something went wrong, couldn\'t get tokens: ' . $e->getMessage();
        }
    }
}

}

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