Erreur router

Je reçois l'erreur suivante :

Code de l'index.php

<?php
require 'vendor/autoload.php';

$router = new Library\Router\Router($_GET['url']);
$router->post('/login', function(){ require 'test.php'; });

$router->run();

Code router :

 private $url;
    private $routes = [];
    private $namedRoutes = [];

    public function __construct($url){
        $this->url = $url;
    }

    public function get($path, $callable, $name = null){
        return $this->add($path, $callable, $name, 'GET');
    }

    public function post($path, $callable, $name = null){
        return $this->add($path, $callable, $name, 'POST');
    }

    private function add($path, $callable, $name, $method){
        $route = new Route($path, $callable);
        $this->routes[$method][] = $route;
        if(is_string($callable) && $name === null){
            $name = $callable;
        }
        if($name){
            $this->namedRoutes[$name] = $route;
        }
        return $route;
    }

    public function run(){
        if(!isset($this->routes[$_SERVER['REQUEST_METHOD']])){
            throw new RouterException('REQUEST_METHOD does not exist');
        }
        foreach($this->routes[$_SERVER['REQUEST_METHOD']] as $route){
            if($route->match($this->url)){
                return $route->call();
            }
        }
        throw new RouterException('No matching routes');
    }

    public function url($name, $params = []){
        if(!isset($this->namedRoutes[$name])){
            throw new RouterException('No route matches this name');
        }
        return $this->namedRoutes[$name]->getUrl($params);
    }

Code route.php

private $path;
    private $callable;
    private $matches = [];
    private $params = [];

    public function __construct($path, $callable){
        $this->path = trim($path, '/');
        $this->callable = $callable;
    }

    public function with($param, $regex){
        $this->params[$param] = str_replace('(', '(?:', $regex);
        return $this;
    }

    public function match($url){
        $url = trim($url, '/');
        $path = preg_replace_callback('#:([\w]+)#', [$this, 'paramMatch'], $this->path);
        $regex = "#^$path$#i";
        if(!preg_match($regex, $url, $matches)){
            return false;
        }
        array_shift($matches);
        $this->matches = $matches;
        return true;
    }

    private function paramMatch($match){
        if(isset($this->params[$match[1]])){
            return '(' . $this->params[$match[1]] . ')';
        }
        return '([^/]+)';
    }

    public function call(){
        if(is_string($this->callable)){
            $params = explode('#', $this->callable);
            $controller = "Library\\Controller\\" . $params[0] . "Controller";
            $controller = new $controller();
            return call_user_func_array([$controller, $params[1]], $this->matches);
        } else {
            return call_user_func_array($this->callable, $this->matches);
        }
    }

    public function getUrl($params){
        $path = $this->path;
        foreach($params as $k => $v){
            $path = str_replace(":$k", $v, $path);
        }
        return $path;
    }