PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1790917333.477.16480.674087|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => 'd25d2385093a8dc570ac8245e9fa0ae7b60bc69241df4bfb4f7ee45772644df5a:2:{i:0;s:5:"_csrf";i:1;s:32:"h97xV60Zdo3HtbmpxEblXvLUqEYHWQuk";}',
    'PHPSESSID' => '5uk5ogge02t0fl4qk4icutpud3',
];