PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791882862.047.16551.595326|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '4e35coh80i99ncs5r3bo6n8cr1',
    '_csrf' => 'a831dfc75ffd3d0a0a96f2cc7a81552d4483306701294328390b1389f4b5df2ea:2:{i:0;s:5:"_csrf";i:1;s:32:"Od797kYwkjj8qLLSh3L4jmymQ30voO1Y";}',
];