PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791442188.005.16477.301341|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '9c786pl6an9qfbvs835t0gjtr1',
    '_csrf' => '07b645a6464d1ec2f79be3f02f6334a61c839e81d1b44fe31c8e6e9640708d64a:2:{i:0;s:5:"_csrf";i:1;s:32:"JJlsBsTqIEXUAAzxk_Mnvif6rEDXMv8E";}',
];