PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => 'fchef261q45bougpfu0uemt2h7',
    '_csrf' => 'b902cd1a42220bebd1254aa46ac22b6cd0213826c48cabce2e3f0346dd5ae92ba:2:{i:0;s:5:"_csrf";i:1;s:32:"jZnRxVttutRJU1EPgsq7ML4wKEVVIvJw";}',
    'topics-session' => '1791192204.473.16479.793895|d197bbbd1d400bd72372bc93068ad169',
];