PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1765952919.568.16079.633784|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '02a2418d8a2fd7ce464765968730b88703141cefe5a7d41bf029e5ae8c92e2d6a:2:{i:0;s:5:"_csrf";i:1;s:32:"yIzeySp2dU-nkd9r2yU0AzKn-FNGYqrX";}',
];