PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1765830076.002.15818.677294|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => 'aaba639e87079c6047aa8c39c31f58362ed7d3557c5a737d5d01fe6adef8077fa:2:{i:0;s:5:"_csrf";i:1;s:32:"AH0sklLW_wOKFn3uVoMKCBlaHgMEgyxx";}',
    'PHPSESSID' => 'ig5dcc33vpc9l8hfn9q680pe91',
];