PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791050021.137.16479.853293|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => 'f94d69fb39d4d03ff5222f9757a672408ebaf9ee4eb818aba359e084e80c8ccaa:2:{i:0;s:5:"_csrf";i:1;s:32:"k7J6mBIGACdhyhjmaDFOg46Qy4CIxhMI";}',
    'PHPSESSID' => 'cgnqikt48q6ant6t707e5kplb0',
];