PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791246936.728.16855.66073|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'b9ef0eqvelkgt83ptsj9qdf3v0',
    '_csrf' => '8b7451e979c9b890c61ac97cf45b8396c0bae6f80aef856c38171f1946266c4aa:2:{i:0;s:5:"_csrf";i:1;s:32:"P3Pd3Yh2abwQPhPfzPLMGdaWJ7oXdAIq";}',
];