Form validation not working

Hi,

I think i cracked this, so the example was modified as per below and it works:

PHP Code:

<?php
namespace App\Controllers;

use CodeIgniter\Controller;
use Config\Services;

class Form extends Controller {

    public $validation;

    public function index()
    {
        helper(['form', 'url']);

        $this->validation = \Config\Services::validation();

        $this->validation->setRules([
            'username' => 'required'
        ]);

        if (!$this->validation->withRequest($this->request)->run())
        {
            echo view('Signup', [
                'validation' => $this->validation
            ]);
        } else
        {
            echo view('Success');
        }
    }
}