PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => 'shga9oresrqb75v32phecoass1',
    '_csrf' => 'd47fd337bc43d8ff7a30e5fd8a09545bfa477079bb5be34163b7fd069c750ce0a:2:{i:0;s:5:"_csrf";i:1;s:32:"t0yYXfFn--UFEPXVhjsGzRpJ54CQrut4";}',
    'topics-session' => '1791589260.826.16477.394037|d197bbbd1d400bd72372bc93068ad169',
];