PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791233318.69.16482.267889|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'e9qhe9j3sm1bij53vlrpnscof1',
    '_csrf' => 'c11c557def466b599640e1495d3602283d981f00dc9471b2f288869566841021a:2:{i:0;s:5:"_csrf";i:1;s:32:"E05CfA5Yz2dOithezPxBchnx3jm_8vmD";}',
];