I'm using XAMPP that has PHP 5.3.1, with restler structure in htdocs folder

In my htdocs folder, I have the index.php

```
<?php
require_once 'vendor/restler.php';
use Luracast\Restler\Restler;

$r = new Restler();
$r->addAPIClass('Say'); // repeat for more
$r->handle(); //serve the response

```

and say.php

```
<?php
class Say {

    /*
    * @url GET /
    */
    function hello($to='world') {
        return "Hello $to!";
    }

    function hi($to) {
        return  "Hi $to!";
    }
}

```

In the browser, I put 

> 
> localhost/index.php/Say
> 
> 
> 

or

> 
> localhost/index.php/Say/hello
> 
> 
> 

it gives me the following message

> 
> Fatal error: Call to undefined function Luracast\Restler\stream\_resolve\_include\_path() in /Applications/XAMPP/xamppfiles/htdocs/Luracast/Restler/AutoLoader.php on line 143
> 
> 
> 

What am I doing wrong?