PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791375990.288.16511.221025|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 't9nvamevfr6l3enc2mn3lpfl36',
    '_csrf' => 'a6f04c6ddf2154f88183482aefd7c08e720598d16b76ed79bb78126d3d4cf82da:2:{i:0;s:5:"_csrf";i:1;s:32:"W3uqhM4evbbFXRIgvDliBIbDrB9ybke1";}',
];