Routes not working properly in codeigniter 4

I am working with Codeigniter 4, Right now i want to execute simple function but i am getting following error

404 page not found

Here is my routes.php

$routes->post('login', 'Form::login');

Here is my “Form Controller”,Where i am wrong ?

public function login()
   {
     echo "Hello world";
   }

In browser i type following url

localhost:8080/login