Calling Model Function

I am very new to CI4 and while I'm getting on well converting the basics of my script based app to CI4, I am strugling with database calls.



From the documentation I believe I configure parameters in my model, and then create functions that utilise these parameters? Something Like this.

PHP Code:

<?php namespace App\Models\Admin;

use CodeIgniter\Model;

class Admin_nav extends Model {
    
protected $table      = 'event_master';
    protected $primaryKey = 'id';

    protected $returnType = 'array';
    
    function admin_links () {
        $admin_links = $this->orderBy('event_from_date', 'desc')
                   ->findAll();
    }
    
    function score_links ($id) {
        $score_links = $this->where('event_id', $id)
                   ->findAll();
    }
} 


and then call a function from the controller, something like this

PHP Code:

<?php namespace App\Controllers\Admin;

class Admin_nav extends BaseController
{
    public function index()
    {
        $event_links = model('Admin\Admin_nav');
    
        $data['links']=$event_links->admin_links();        
        
        
        echo view('templates/admin_nav_test',$data);
    }
} 


But am geeting an error "Call to a member function admin_links() on null" which I do not understand?

Please tell me I'm on the right track???