PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => 'fkcgi9sfnhvr9h0a6k08nncp01',
    '_csrf' => '01e580988469e458901ff9f350fa2746665cd50ffe2894cf132c2bc647be5409a:2:{i:0;s:5:"_csrf";i:1;s:32:"o4N2OL3Vp5sx7Zt5eDzK4koSJBJBwGj6";}',
    'topics-session' => '1791082158.496.16855.647562|d197bbbd1d400bd72372bc93068ad169',
];