PHP CodeIgniter 4 - Form Submission - error Can t find a route for registrations index

Question

The route is created in appConfigRoutes.php, and I'm using the form open() helper method within the view to specify the controller method to handle the form submission action.

Still receiving a mistake No route found for "registrations/index."

Please help with this problem. The provided code snippets can be found below.

Error:

register.php view file:

            <?php echo form_open('/registrations/index'); ?>

Registrations.php controller:

class Registrations extends BaseController {

    public function index() {

        $data['coursename'] = $this->getCourseName();  

        log_message('info','name field >' . $this->request->getVar('iname') . '<<');

        echo view('templates/header');
        echo view('pages/register', $data);
        echo view('templates/footer');
    }

Routes.php

$routes->get('/registrations/index', 'Registrations::index');