PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => 'r8dn6v7i2muc0ehopo7j3ovfv2',
    'topics-session' => '1791526279.268.16940.320579|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '948a1308fd94bb127965ef35d6a4cbf3bc16fc2c9bcbb95e1235a937d61e9f8ea:2:{i:0;s:5:"_csrf";i:1;s:32:"vQIPK8XznPwCtteEQr325_twmY1ecDLZ";}',
];