PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => '4bqd43rjbpka930i3bimelgfr1',
    'topics-session' => '1790982203.633.16482.815519|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '00434e9d8082c66caabb1239c2a6809972882fce3d58555fa65641c0c41c807ba:2:{i:0;s:5:"_csrf";i:1;s:32:"66El3Wowr4EopYgC7PXJaF3xNc4S2NdM";}',
];