PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1790887466.41.16697.646568|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'g7r9l9f6dk29tsa6m19fh0bgk1',
    '_csrf' => 'c92335b357825a4cca4b37df88207331b2ad626cf1b5a052b2387b5eb11fef79a:2:{i:0;s:5:"_csrf";i:1;s:32:"wVbkS4ZzyFE2Ru5pf0kA8yJXFNDzchRX";}',
];