PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791857504.257.17008.222705|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => 'b0f73a9a804ddb22dc96455d5e5e242b89c064a0be5e5c563fd6c44e82ab326da:2:{i:0;s:5:"_csrf";i:1;s:32:"5KMRB3vc_kju_ee4cq1uOQFPWARgZQe7";}',
    'PHPSESSID' => 'g3vfg1d29hpndqhv9d723qpr32',
];