PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791132509.294.16475.429716|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'f7h8df4cdmvksniasma7e467n6',
    '_csrf' => '394acc15edc66f8686b25a8d47907b1bdaa61f200e408bb7595d4bffe13fda4fa:2:{i:0;s:5:"_csrf";i:1;s:32:"W_kIdgwRDdvYyhFj0F_ZRrw7wiPDQ7jR";}',
];