MAMP：include_once'model.php'，无法打开流：没有这样的文件或目录

Question

Controller.php这样

<?php
include_once 'model.php';

class Controller {
 public $model;

 public function __construct()  
    {  
        $this->model = new Model();

    } 

 public function invoke()
 {
  //my code
}

?>

我把model.php放在模型中但是当我尝试localhost：8888 / innoshop /时，我得到了这样的错误：

Message: include_once(model.php): failed to open stream: No such file or directory
Message: include_once(): Failed opening 'model.php' for inclusion (include_path='.:/Applications/MAMP/bin/php/php5.5.14/lib/php')