PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791239086.805.16478.952073|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '88sk9midacma8rsf95d622beg6',
    '_csrf' => 'fe9e1b736f60dbbe11b860f692cfe2ad1bb55468600e15ca532349734ca1e7d2a:2:{i:0;s:5:"_csrf";i:1;s:32:"BuvForU5rvwj_dYnCErQn82Z8cE0ixIG";}',
];