PHP 8.1.3 为什么方法调用在调用时无法启动？

我正在尝试为我的站点创建一个 MVC 模板，并且正在测试身份验证代码。屏幕或日志文件上没有显示错误，但是代码没有完成。当我尝试调用 findUser() 时，它就死了。

当我从身份验证控制器调用关联的类/方法时，什么也没有发生。这是该区域的代码。请注意回显语句，以及我如何从未得到“开始：tAuthentication - findUser 方法”

我正在使用 PHP 8.1.3_1 和最新版本的 Apache。

    # File: InitializeMVC.php
require_once CORE_PATH . 'Database.php';


# File: AuthenticationControl.php
require_once MODEL_PATH . 'tAuthentication.php';

class Authentication {
   public object $AuthenticationModel;
        
   public function __construct(){
      echo "Begin: AuthenticationControl | construct: " .  " 
";
      $AuthenticationModel = new tAuthentication;
   }

   public function login() {
      echo "Begin: AuthenticationControl | login: "  . " 
";   
      $data['Uname'] = "testuser";
      echo "Data loaded.  Go to model.
";
      $userid = $AuthenticationModel->findUser($data['Uname']);
      echo "Return to AuthenticationControl with userid. 
";

    } 
}

# File: tAuthentication.php
class tAuthentication extends Database {

   public function __construct() {
      echo "Begin: AuthenticationModel | construct: " .  " 
";
      $this->db = new Database;

   public function findUser($username){
      echo "Begin: tAuthentication - findUser method 
";
      $this->db->query('SELECT PeopleID FROM vAuthenticate WHERE username = :username OR email = :username');
      $this->db->bind(':username', $username);
      $row = $this->db->GetData();
   }
}

# Begin: AuthenticationControl | construct:
# Begin: tAuthentication | construct:
# Begin: AuthenticationControl | login:
# Data loaded. Go to model.