PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791222473.488.16814.872476|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '2vj1h538jhnss2073mvquge6s5',
    '_csrf' => 'a2539c5563204a03b11602d2bd7797c35300a3bf17bc0d64d1d50b6a51436ce3a:2:{i:0;s:5:"_csrf";i:1;s:32:"_x-NG24XBeg-rXMgdpIzKospXSlAsWZy";}',
];