PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => 'enu2suel6r74pjk6rhdk50t694',
    'topics-session' => '1791985223.38.17043.406627|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => 'fad75d63304d60e099b95bd094e824ea27fda2570193c78b48b182ba35067027a:2:{i:0;s:5:"_csrf";i:1;s:32:"-t9NTwF4BY6BSLFTFqBw_FsP9tE3mM6p";}',
];