PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791441931.885.17009.416659|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'c9l66klfkf882h5i0fbkop1294',
    '_csrf' => 'cd8a014d5787767c5c4275f94b87209f55117764c1cd88741976868ac96ac06fa:2:{i:0;s:5:"_csrf";i:1;s:32:"l1KPH358uh5Brm0KRWXVScawjGwU9HFX";}',
];