"Undefined property: CI_Loader"

[eluser]Dauntless[/eluser]
Hi,

I've already built an entire site with CI, but for some reason I'm stuck at the start with my next site...

What I have now:

Code:

<?php

class Main extends Controller {

    function Main()
    {
        parent::Controller();    
    }
    
    function index()
    {
        $data = array();
        $data["toLoad"] = "main";
        $data["active"] = 1;
        $this->load->view('mainView', $data);
    }
}

?>

And my view:

Code:

<?php $this->load->view("includes/header") ?>
    <!-- ... -->
<?php $this->load->view("includes/footer") ?>

And in my header I just have:

Code:

<?=$this->active ?>

Now I get an error saying

A PHP Error was encountered

Severity: Notice

Message: Undefined property: CI_Loader::$active

Filename: includes/header.php

Line Number: 1

Why doesn't he find my $active ?

I know it's probably something stupid, but I just can't figure it out :S

Greets!