PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791412598.958.16697.259133|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => 'c6595621be33b29e7d2d7227e9e0eeea83f5966489cf3be7bcded0dc77ecd8f9a:2:{i:0;s:5:"_csrf";i:1;s:32:"uKntvWMd_KyCALWB6FSR5BBHffZJSbsh";}',
];