PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791857216.968.17043.607528|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '2b0eefffb9b8516da933f6f28f2fe080bbe691b26f71a07a31b0b385d2edee1fa:2:{i:0;s:5:"_csrf";i:1;s:32:"n6M61QZIQUBjEPQisfjsybMps9RDBPN6";}',
    'PHPSESSID' => 'kidc20nu88rm5m1it92a476j07',
];