PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791227712.171.17009.514492|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '7aa272bb111b16e68520d5c3358ffd9de2b8e766bfc5cc35e75f0bebb5134709a:2:{i:0;s:5:"_csrf";i:1;s:32:"ISv6SKebD7SMvOOhhUdzeeLkSsSAcyBN";}',
    'PHPSESSID' => 'teefd3bviotur8jrulfalot2m4',
];