PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => '6vdgqngs3itmd97mo6c8q6ud81',
    'topics-session' => '1791728146.414.17008.56337|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '27b4e182328a5b8ebbf07198faae8bd6084dc0b1f9ced2a00c761c09e93622e6a:2:{i:0;s:5:"_csrf";i:1;s:32:"zpmyTG2x45-FnN42FevjWvwZfI887DUy";}',
];