PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1790965931.041.16479.753159|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 't25hmudlnnnmhu678c6rfkg777',
    '_csrf' => 'd37549867c7a48db0caa8a1da895cf44952554c995f03049a6f801157b26fa13a:2:{i:0;s:5:"_csrf";i:1;s:32:"kpS77V-LSLkBZiND-GIfzCKsdQ1s40HP";}',
];