PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791248079.62.16479.577492|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '2dr4evs5msl0saasfdslhv34p1',
    '_csrf' => '8e9247a56d0efb400b163badb036acf31c1c4e30d0687f67ae88d4eff2dc4eeea:2:{i:0;s:5:"_csrf";i:1;s:32:"macLDBreVrzuQXlAB7Us7mIwJtJVczXA";}',
];