PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791631201.041.17008.969146|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'aaqgtkr5u0sil9conbqk81ihn7',
    '_csrf' => 'd749eedf0127884910edae91ece889d6ba126ce9d6d678f9202eb79083544bbaa:2:{i:0;s:5:"_csrf";i:1;s:32:"T8tkZ-S1MT0TmrGqibQfFi8d0kD-i-QL";}',
];