PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791227010.133.17009.310228|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'qpb4sopalghk2vfrdi9fsidkg3',
    '_csrf' => 'b9f38ad222238f3783dadc05f680e693301a1d852e207514da385ba90a8a6c0aa:2:{i:0;s:5:"_csrf";i:1;s:32:"394B-83WWg7K2GZdocqvBOZqvVdPoSxx";}',
];