PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791026962.522.16490.465157|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'mqru8cqp84us2t7orb7bceo6o6',
    '_csrf' => '3d874c3d72d588fb559f4680d5da552d9ac8e83a16468a739c337f46c97e29faa:2:{i:0;s:5:"_csrf";i:1;s:32:"Ijb39EKIi7DIaDbdoTqIXD8K9sS39J1x";}',
];