PHP Core Warning – yii\base\ErrorException

$_GET = [
    'r' => 'site/finishes',
];

$_COOKIE = [
    'XTCsid' => '41eonjaondg11sdi462hnp0mt3',
    'mcontent' => '3',
    '_visitor_id' => '-O2n3Q-t3-aeRBc9eO8b',
    '_auth_token' => 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ2aXNpdG9ySWQiOiItTzJuM1EtdDMtYWVSQmM5ZU84YiIsImF1dGhlbnRpY2F0ZWQiOm51bGwsImF1dGhQcm92aWRlciI6bnVsbCwiZXhwIjoxNzI0NjU2OTQxLCJpYXQiOjE3MjIwNjQ5NDF9._DyekDXudglVZTVBvb9shqdvyeE89rInQkGfGqB9zds',
];

$_SESSION = [
    '__flash' => [],
];