PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791487991.124.16476.479291|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '9ivhgmdo5hk1j1mid5vqa03b63',
    '_csrf' => 'a9e4e2ea492a7b7a65298e3ef47b3c7faa5bfd8ef8ba0867808abfb5294f2df7a:2:{i:0;s:5:"_csrf";i:1;s:32:"Z9T4yQgA-_8h7_YuPEpv4bctFAhwcdu9";}',
];