PHP Core Warning – yii\base\ErrorException

$_GET = [
    'redirect_url' => '/yjds2016/cases/match',
];

$_COOKIE = [
    'topics-session' => '1791728817.543.16975.998535|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 't5c7boccpse22al9pv9m2v7li7',
    '_csrf' => '02caa2bb2b27057e359ec7ad309eb994c0f3396d02df405efcbc28e80097f35aa:2:{i:0;s:5:"_csrf";i:1;s:32:"2BoRHgvb0U4_8Hqz3cDkuJgqY92ICb7w";}',
];