PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791414812.807.16814.873507|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '53r5an5j4vnqbgoolb6khsr8b6',
    '_csrf' => '9a1410d33e18986ff274d9131dc7009cbf89da1a7f779a6d070e1e8abbf41ba5a:2:{i:0;s:5:"_csrf";i:1;s:32:"vk-VLg6noqpDHxh6omlR8b770qq088GC";}',
];