PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1790940724.527.16477.409938|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '54mrehn0kt7a9vl7jc2fnu15c0',
    '_csrf' => 'c3c80c53d9b09af57ab19b7e83824261c60b6e9cfaad0bf684dcd43752a64dbba:2:{i:0;s:5:"_csrf";i:1;s:32:"qGm3G-XCDFErGCJT60tTA0W53bZUFkxz";}',
];