PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => 'f7t66d8n7ffrt8lc4ns1ssq685',
    '_csrf' => 'f85cbbc396dba2eec90912c27d812fe1c7a0ece091c8c08af170492356170f3ba:2:{i:0;s:5:"_csrf";i:1;s:32:"NJWWMO4awFkfGGUih_iRH6mGip0e_OnE";}',
    'topics-session' => '1791410916.294.16511.373629|d197bbbd1d400bd72372bc93068ad169',
];