PHP Core Warning – yii\base\ErrorException

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

$_COOKIE = [
    'topics-session' => '1791119728.803.17043.862718|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '9f6ork9k4nc8t3puu1hkcasq46',
    '_csrf' => 'cd95dabb5f2c17b89e9dea773d5ed2eb219ad7ef0e6b4f7f5425a98449d18b3aa:2:{i:0;s:5:"_csrf";i:1;s:32:"XGL-MEZabPQPRsDMwhmif4jYsvgnP4Qt";}',
];