PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => 'uha13qs6r3813av7h41jisr0q6',
    '_csrf' => '8f12fa8646fdd1824339eefde49e2363748cf511f6fe0e5b880bd0dde2fc4a00a:2:{i:0;s:5:"_csrf";i:1;s:32:"b_Rzfo1-5cKtxaLeHECXzru_IaAxJDq2";}',
    'topics-session' => '1791409147.441.16478.750726|d197bbbd1d400bd72372bc93068ad169',
];