PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => '7pme0qu8c86qd6s7m6knoki1r2',
    '_csrf' => 'cd9d38341f411662cb28d65429674a7279c7f174c10e4fcbcbfd75c7a9017faaa:2:{i:0;s:5:"_csrf";i:1;s:32:"UMecYxQuFAwPAZbiytjAyNcjlT8nue0b";}',
    'topics-session' => '1791581149.712.16476.73516|d197bbbd1d400bd72372bc93068ad169',
];