解析错误：语法错误，意外的“？”

帮我找出错误，我已经仔细检查了 20 次

引发解析错误：语法错误，意外的“？” 在 D:\wordpress\openserver\OpenServer\domains\php-framework-master\application\models\Main.php 第 35 行

这是第 31-35 行的代码

    public function postsList($route) {
    $max = 10;
    $params = [
        'max' => $max,
        'start' => ((($route['page'] ?? 1) - 1) * $max),
    ];
    return $this->db->row('SELECT * FROM posts ORDER BY id DESC LIMIT 
:start, :max', $params);
  }

通知出来后，指向行

'list' => $this->model->postsList($this->route['page']),

所有代码

public function indexAction() {
    $pagination = new Pagination($this->route, $this->model->postsCount());
    $vars = [
        'pagination' => $pagination->get(),
        'list' => $this->model->postsList($this->route['page']),
    ];
    $this->view->render('Главная страница', $vars);
}