PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791380654.136.16974.515224|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '237n7n6r7kmukbp6klkteq23q3',
    '_csrf' => '46706ed7a3a7b8f1b59d14a9d85f508b33d96e4b3d161b35ddb15aaf4a761796a:2:{i:0;s:5:"_csrf";i:1;s:32:"1ODBOO8GcHvJP2PqIp5ZNPlbyARh1vc6";}',
];