CODEIGNITER 4 Post returns "error 404"

I'm trying to use a post method in a form, but returns "error 404".

If anyone know what is happening please help me. Thanks


HTML:

PHP Code:

<form action="<?= site_url('auth/save'); ?>" method="post" enctype="multipart/form-data" class="user"> 


CONTROLLER:

PHP Code:

public function save(){
    // Validando la solicitud

    $validation = $this->validate([
        'name'=>'required',
        'email'=>'required|valid_email|is_unique(users.email)',
        'password'=>'required|min_length[5]|max_length[12]',
        'cpassword'=>'required|min_length[5]|max_length[12]|matches[password]'
    ]);
    if (!$validation){
        $page_name = 'Registrarse';
        //return view('auth/offline_header',array('page_name' => $page_name)).view('auth/register',['validation'=>$this->validator]).view('auth/offline_footer');
        return view('auth/register',['validation'=>$this->validator]);
    }else{
        echo 'Form validated successfully';
    }

} 


ERROR:

Can't find a route for 'auth/save'.

Wrong route or class name, or not enough data to identify the problem.

Since auto routing is disabled you need to write your routing line for your post processes as well:

PHP Code:

$routes->post('YourController/your_method', 'YourController::your_method');