PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791210101.034.17009.819859|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '7e2d61a33fff34211fd624f2458b1839377f977464f5e4aa49c026e1fd3dac66a:2:{i:0;s:5:"_csrf";i:1;s:32:"kOIbSWoxMDiMc7oT6NtdeDnfxjFF1F0U";}',
    'PHPSESSID' => '2k5bjhdg73fpovlnelo76abum7',
];