PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => 'r1bt7oi957vnmldd493h1amhb0',
    '_csrf' => 'f9e943ce43a3537270d32f61b7bc8ba6fd1b57139ac110c7a7a7a7e603e25284a:2:{i:0;s:5:"_csrf";i:1;s:32:"Jcz9f_wlOA_J1Ec7FXN9RE_35injyQCP";}',
    'topics-session' => '1791211068.846.16940.249401|d197bbbd1d400bd72372bc93068ad169',
];