PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => 'en650nedslcclp5hqce24d50v1',
    '_csrf' => 'c0c3462641e6dfee5aefbd19dc216d5fa802cdec49734e48d2a9920bb6f31e91a:2:{i:0;s:5:"_csrf";i:1;s:32:"SYA4qdsM3GuzSkKTk-5zdC49l5HlLQc2";}',
    'topics-session' => '1790952488.291.16517.656748|d197bbbd1d400bd72372bc93068ad169',
];