Object not found! error when I want using route in php - php

Question

I'm watching a tutorial video from youtube about making simple route project with just php and I did exactly what he did but there is an error in my project and I can't fix that . when I'm trying to write 'about' or 'contact' the webpage went to object not found! error
Object not found!
The requested URL was not found on this server. If you entered the URL
manually please check your spelling and try again.
If you think this is a server error, please contact the webmaster.
Error 404
localhost
Apache/2.4.43 (Win64) OpenSSL/1.1.1g PHP/7.4.5
by the way I'm using xampp
This is my route class
class Route{
private $_uri = array();
/**
* Builds a collection of internal URL's to look for
* #param $uri
*/
public function add($uri){
$this->_uri[] = trim($uri,"/");
}
public function submit(){
$uriGetParam = isset($_GET['uri']) ? $_GET['uri'] : "/";
foreach ($this->_uri as $key => $value){
if (preg_match("#^$value$#",$uriGetParam)){
echo "Match!";
}
}
}
}
This is my php code (index)
include "route.php";
$route = new Route();
$route->add("/");
$route->add("/contact");
$route->add("/about");
$route->submit();
And finally this is my .htaccess file
RewriteEngine On
RewriteBase /route/
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.+)$ index.php?uri=$1 [QSA,L]