PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791575644.95.16901.60480|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '046696f1b227b74b3f13ac3c6b2b215af86e7f998a31c68bc439de55d8c74b2da:2:{i:0;s:5:"_csrf";i:1;s:32:"jRSai-48hke2sc1fnh9s5MG6DuG3I-p-";}',
    'PHPSESSID' => 'vkhft3f8mh5a8h1o0a82ro1mp7',
];