PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => 'haiua84mckli2qjeqda0n5nk91',
    '_csrf' => 'd1f461448b75f8256c883f1ffb03e7dc737b4d6b93599a40e2afa1fabda9c955a:2:{i:0;s:5:"_csrf";i:1;s:32:"86DQ3nSJVThiGydVdl0CtuDj-8j405j7";}',
    'topics-session' => '1791405163.232.16479.553859|d197bbbd1d400bd72372bc93068ad169',
];