PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => 'nndglkpkat53hl12acdd31ift0',
    'topics-session' => '1791490246.574.16814.428062|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => 'eb5ddf66bd736542a3285c85dc5a5ec63182fa9e50ceb67b1b9b7256e59bd4bca:2:{i:0;s:5:"_csrf";i:1;s:32:"1FV1X1KsS2ou6q0OcF4dFnETbDmtiE_W";}',
];