PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'PHPSESSID' => 'f7l0cdf6ngfn5furehqv61jtd4',
    'topics-session' => '1790898232.464.16480.574152|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '7008306fb9a8b3ffadfd6545bbcf1126be566698ffad2b02ca27df90e9b874d1a:2:{i:0;s:5:"_csrf";i:1;s:32:"Scjy7d94U8IplqLXwRKxQVXQPf0jpAVF";}',
];